buffer: make methods work on Uint8Array instances #56578
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #56578 +/- ##
=======================================
Coverage 88.51% 88.52%
=======================================
Files 703 703
Lines 208430 208451 +21
Branches 40198 40189 -9
=======================================
+ Hits 184491 184524 +33
+ Misses 15951 15945 -6
+ Partials 7988 7982 -6
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addaleax
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Jan 13, 2025
lib/internal/buffer.js
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| return FunctionPrototypeCall(readInt16BE, this, offset); | ||
| if (byteLength === 1) | ||
| return this.readInt8(offset); | ||
| return FunctionPrototypeCall(readInt8, this, offset); |
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This is already (correctly imo) marked as needing a benchmark CI run, but just as a heads up, if this does turn out to be an issue, it shouldn't be a big deal to create non-prototype versions of these functions that don't use this as the target
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Yea I was thinking of that as an alternative implementation but took the route of least blast radius to start, happy to go through and change them to match the other int parsers that take the argument. (Should we go ahead and do that regardless of the benchmarks?)
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Should we go ahead and do that regardless of the benchmarks?
No strong preferences from my side, maybe somebody else has one. But for now, I'd say we can fix the failures reported by GHA, then run regular CI + benchmark CI and see what happens
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buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='two_bytes' ** -1.37 % ±0.99% ±1.32% ±1.71%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='latin1' ** 2.49 % ±1.83% ±2.45% ±3.24%
buffers/buffer-creation.js n=600000 len=1024 type='slow-allocUnsafe' *** -3.01 % ±1.32% ±1.76% ±2.29%
buffers/buffer-creation.js n=600000 len=4096 type='fast-allocUnsafe' *** -4.03 % ±2.22% ±2.96% ±3.85%
buffers/buffer-creation.js n=600000 len=8192 type='fast-allocUnsafe' ** -2.50 % ±1.64% ±2.19% ±2.86%
buffers/buffer-creation.js n=600000 len=8192 type='slow-allocUnsafe' ** -2.49 % ±1.44% ±1.92% ±2.50%
buffers/buffer-fill.js n=20000 size=8192 type='fill("t", 0)' ** -4.09 % ±3.06% ±4.09% ±5.37%
buffers/buffer-from.js n=800000 len=100 source='uint16array' *** -2.03 % ±0.98% ±1.31% ±1.71%
buffers/buffer-from.js n=800000 len=2048 source='arraybuffer-middle' ** 1.65 % ±1.21% ±1.61% ±2.09%
buffers/buffer-from.js n=800000 len=2048 source='arraybuffer' ** 1.82 % ±1.10% ±1.46% ±1.91%
buffers/buffer-swap.js n=1000000 len=256 method='swap32' aligned='false' ** 0.75 % ±0.48% ±0.64% ±0.84%
buffers/buffer-swap.js n=1000000 len=768 method='swap16' aligned='false' ** -1.57 % ±1.08% ±1.45% ±1.90%
buffers/dataview-set.js n=1000000 type='Uint16BE' *** -24.92 % ±1.98% ±2.65% ±3.50%
buffers/dataview-set.js n=1000000 type='Uint16LE' *** -25.11 % ±0.99% ±1.32% ±1.72%
23.55 false positives, when considering a 5% risk acceptance (*, **, ***),
4.71 false positives, when considering a 1% risk acceptance (**, ***),
0.47 false positives, when considering a 0.1% risk acceptance (***)
Just filtered for the two and three star confidence ones and the changes are small, except for oddly the dataview tests, which just happen to be in the buffers folder, not sure how I could've changed that value but maybe this won't reproduce in CI? 🤞🏻
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I think the up-to-minus-4% regressions on the others are also a bit concerning though 😕
To me this does feel like an impact we'd want to avoid if we can at all
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SGTM, I'll try switching over to direct invocations and see if we climb back up
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nbbeeken
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Jan 16, 2025
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| // Sanity check (remove if the internals of Buffer.from change): | ||
| // The custom implementation of utf8Write should cause Buffer.from() to encode | ||
| // traversalPath instead of the sanitized output of resolve(). | ||
| assert.strictEqual(Buffer.from(resolve(traversalPathWithExtraChars)).toString(), traversalPath); |
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If I understood correctly this can be deleted now that Buffer.prototype.utf8Write tampering doesn't impact from/toString. However, the test still has value (along with the tampering code above) if that were to be reversed at any point.
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Jan 18, 2025
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toString()write()[Symbol.for('nodejs.util.inspect.custom')]()includes()readIntBE()(byteLength: 4, 2, 1)readIntLE()(byteLength: 4, 2, 1)readUIntBE()(byteLength: 4, 2, 1)readUIntLE()(byteLength: 4, 2, 1)
still need to update the docs, just noting the functions changed here
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Running: node benchmark/compare.js --runs 10 --old ./node-main --new ./node-buffer-generic-methods buffers > compare-buffer-generic-methods.csvUsing the node version of the compare tool: node-benchmark-compare compare-buffer-generic-methods.csv Gave these results: confidence improvement accuracy (*) (**) (***)
buffers/buffer-atob.js n=1000000 size=128 -0.33 % ±1.48% ±2.06% ±2.87%
buffers/buffer-atob.js n=1000000 size=16 -0.43 % ±1.89% ±2.60% ±3.57%
buffers/buffer-atob.js n=1000000 size=32 0.20 % ±2.27% ±3.12% ±4.27%
buffers/buffer-atob.js n=1000000 size=64 1.98 % ±2.06% ±2.95% ±4.29%
buffers/buffer-base64-decode-wrapped.js n=32 linesCount=524288 charsPerLine=76 1.88 % ±4.92% ±7.02% ±10.20%
buffers/buffer-base64-decode.js size=8388608 n=32 -3.53 % ±6.38% ±9.12% ±13.32%
buffers/buffer-base64-encode.js n=32 len=67108864 0.41 % ±3.63% ±4.97% ±6.77%
buffers/buffer-base64url-decode.js size=8388608 n=32 -1.71 % ±3.26% ±4.62% ±6.65%
buffers/buffer-base64url-encode.js n=32 len=67108864 0.95 % ±1.94% ±2.70% ±3.76%
buffers/buffer-btoa.js n=1000000 size=1024 -0.39 % ±0.72% ±0.99% ±1.35%
buffers/buffer-btoa.js n=1000000 size=128 -0.86 % ±1.39% ±1.90% ±2.59%
buffers/buffer-btoa.js n=1000000 size=16 0.09 % ±0.74% ±1.01% ±1.39%
buffers/buffer-btoa.js n=1000000 size=256 -0.85 % ±2.47% ±3.42% ±4.75%
buffers/buffer-btoa.js n=1000000 size=32 0.33 % ±0.54% ±0.74% ±1.01%
buffers/buffer-btoa.js n=1000000 size=64 -0.22 % ±0.73% ±1.03% ±1.46%
buffers/buffer-bytelength-buffer.js n=4000000 len=16 -0.05 % ±0.63% ±0.86% ±1.18%
buffers/buffer-bytelength-buffer.js n=4000000 len=2 -4.01 % ±8.08% ±11.59% ±17.02%
buffers/buffer-bytelength-buffer.js n=4000000 len=256 1.11 % ±1.67% ±2.36% ±3.38%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='four_bytes' 0.02 % ±0.68% ±0.95% ±1.33%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='latin1' 1.62 % ±3.25% ±4.45% ±6.07%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='one_byte' -0.63 % ±2.80% ±3.86% ±5.29%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='three_bytes' -0.52 % ±4.01% ±5.52% ±7.56%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='two_bytes' 0.72 % ±2.18% ±3.02% ±4.20%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='four_bytes' -0.04 % ±0.68% ±0.94% ±1.28%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='latin1' -2.31 % ±4.13% ±5.84% ±8.37%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='one_byte' -1.07 % ±1.18% ±1.69% ±2.48%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='three_bytes' -1.35 % ±3.37% ±4.76% ±6.82%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='two_bytes' -0.15 % ±0.48% ±0.67% ±0.94%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='four_bytes' 0.05 % ±7.36% ±10.11% ±13.83%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='latin1' -0.07 % ±0.88% ±1.23% ±1.71%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='one_byte' -1.12 % ±3.74% ±5.14% ±7.01%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='three_bytes' 2.65 % ±3.43% ±4.72% ±6.47%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='two_bytes' 1.05 % ±4.78% ±6.64% ±9.22%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='four_bytes' -0.94 % ±1.99% ±2.80% ±3.98%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='latin1' 0.07 % ±1.60% ±2.22% ±3.11%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='one_byte' 0.31 % ±0.80% ±1.11% ±1.57%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='three_bytes' -1.70 % ±4.80% ±6.84% ±9.92%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='two_bytes' -0.55 % ±0.98% ±1.36% ±1.86%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='four_bytes' 0.76 % ±3.63% ±4.98% ±6.79%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='latin1' -0.48 % ±2.06% ±2.91% ±4.15%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='one_byte' -2.11 % ±4.75% ±6.56% ±9.08%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='three_bytes' 0.18 % ±3.68% ±5.04% ±6.86%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='two_bytes' 1.22 % ±4.41% ±6.04% ±8.25%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='four_bytes' -0.60 % ±2.68% ±3.68% ±5.01%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='latin1' 0.33 % ±1.31% ±1.81% ±2.48%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='one_byte' -0.88 % ±4.50% ±6.24% ±8.67%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='three_bytes' -2.61 % ±6.54% ±9.34% ±13.61%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='two_bytes' 0.03 % ±0.79% ±1.09% ±1.50%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='four_bytes' -0.36 % ±3.78% ±5.18% ±7.06%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='latin1' 2.73 % ±5.85% ±8.20% ±11.60%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='one_byte' 0.94 % ±2.95% ±4.04% ±5.51%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='three_bytes' -1.58 % ±2.79% ±4.00% ±5.85%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='two_bytes' -0.50 % ±4.02% ±5.54% ±7.61%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='four_bytes' -0.41 % ±1.03% ±1.42% ±1.94%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='latin1' 0.32 % ±0.86% ±1.18% ±1.62%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='one_byte' ** -1.90 % ±1.27% ±1.82% ±2.67%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='three_bytes' -0.47 % ±0.86% ±1.21% ±1.72%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='two_bytes' -2.18 % ±3.98% ±5.69% ±8.31%
buffers/buffer-compare-instance-method.js n=1000000 args=1 size=16 -1.38 % ±2.93% ±4.08% ±5.70%
buffers/buffer-compare-instance-method.js n=1000000 args=1 size=16386 1.46 % ±1.62% ±2.28% ±3.24%
buffers/buffer-compare-instance-method.js n=1000000 args=1 size=4096 * -1.85 % ±1.40% ±1.98% ±2.84%
buffers/buffer-compare-instance-method.js n=1000000 args=1 size=512 0.17 % ±1.30% ±1.81% ±2.53%
buffers/buffer-compare-instance-method.js n=1000000 args=2 size=16 *** 2.89 % ±0.64% ±0.89% ±1.22%
buffers/buffer-compare-instance-method.js n=1000000 args=2 size=16386 1.50 % ±1.84% ±2.57% ±3.61%
buffers/buffer-compare-instance-method.js n=1000000 args=2 size=4096 * 3.19 % ±2.31% ±3.25% ±4.62%
buffers/buffer-compare-instance-method.js n=1000000 args=2 size=512 * 6.97 % ±6.06% ±8.71% ±12.80%
buffers/buffer-compare-instance-method.js n=1000000 args=5 size=16 *** 2.68 % ±1.05% ±1.46% ±2.04%
buffers/buffer-compare-instance-method.js n=1000000 args=5 size=16386 0.12 % ±1.20% ±1.64% ±2.24%
buffers/buffer-compare-instance-method.js n=1000000 args=5 size=4096 -0.68 % ±3.14% ±4.47% ±6.48%
buffers/buffer-compare-instance-method.js n=1000000 args=5 size=512 *** 2.84 % ±0.92% ±1.26% ±1.71%
buffers/buffer-compare-offset.js n=1000000 size=16 method='offset' *** 1.85 % ±0.50% ±0.69% ±0.95%
buffers/buffer-compare-offset.js n=1000000 size=16 method='slice' ** 1.07 % ±0.71% ±1.00% ±1.43%
buffers/buffer-compare-offset.js n=1000000 size=16386 method='offset' *** 2.51 % ±0.32% ±0.43% ±0.59%
buffers/buffer-compare-offset.js n=1000000 size=16386 method='slice' -0.41 % ±1.20% ±1.65% ±2.26%
buffers/buffer-compare-offset.js n=1000000 size=4096 method='offset' *** 2.96 % ±0.92% ±1.30% ±1.86%
buffers/buffer-compare-offset.js n=1000000 size=4096 method='slice' -0.18 % ±1.23% ±1.69% ±2.31%
buffers/buffer-compare-offset.js n=1000000 size=512 method='offset' *** 2.53 % ±0.64% ±0.88% ±1.22%
buffers/buffer-compare-offset.js n=1000000 size=512 method='slice' -0.38 % ±1.43% ±1.96% ±2.67%
buffers/buffer-compare.js n=1000000 size=16 0.33 % ±1.12% ±1.55% ±2.12%
buffers/buffer-compare.js n=1000000 size=16386 0.59 % ±1.41% ±1.97% ±2.76%
buffers/buffer-compare.js n=1000000 size=4096 0.27 % ±0.60% ±0.82% ±1.13%
buffers/buffer-compare.js n=1000000 size=512 0.53 % ±1.02% ±1.43% ±2.04%
buffers/buffer-concat-fill.js n=800000 extraSize=1 0.63 % ±2.30% ±3.18% ±4.40%
buffers/buffer-concat-fill.js n=800000 extraSize=1024 -0.05 % ±4.65% ±6.38% ±8.70%
buffers/buffer-concat-fill.js n=800000 extraSize=256 1.99 % ±4.19% ±5.79% ±7.97%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=16 1.57 % ±1.98% ±2.74% ±3.81%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=4 6.34 % ±8.16% ±11.62% ±16.88%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=16 1.05 % ±7.05% ±9.66% ±13.16%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=4 1.81 % ±9.27% ±12.71% ±17.31%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=16 0.20 % ±2.85% ±3.91% ±5.33%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=4 * 5.00 % ±4.50% ±6.34% ±9.02%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=16 3.95 % ±4.90% ±6.87% ±9.71%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=4 * 3.30 % ±3.03% ±4.18% ±5.75%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=16 0.71 % ±2.41% ±3.31% ±4.52%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=4 10.85 % ±12.14% ±17.33% ±25.23%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=16 -0.86 % ±3.06% ±4.24% ±5.89%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=4 3.84 % ±4.50% ±6.36% ±9.11%
buffers/buffer-copy.js n=6000000 partial='false' bytes=1024 -2.50 % ±6.74% ±9.67% ±14.20%
buffers/buffer-copy.js n=6000000 partial='false' bytes=128 0.22 % ±0.74% ±1.03% ±1.42%
buffers/buffer-copy.js n=6000000 partial='false' bytes=8 * 0.84 % ±0.84% ±1.18% ±1.67%
buffers/buffer-copy.js n=6000000 partial='true' bytes=1024 4.44 % ±8.55% ±12.28% ±18.06%
buffers/buffer-copy.js n=6000000 partial='true' bytes=128 0.48 % ±0.84% ±1.17% ±1.65%
buffers/buffer-copy.js n=6000000 partial='true' bytes=8 2.00 % ±3.93% ±5.61% ±8.19%
buffers/buffer-creation.js n=600000 len=10 type='fast-alloc-fill' 0.24 % ±2.53% ±3.49% ±4.81%
buffers/buffer-creation.js n=600000 len=10 type='fast-alloc' -1.11 % ±3.17% ±4.44% ±6.26%
buffers/buffer-creation.js n=600000 len=10 type='fast-allocUnsafe' 3.02 % ±4.03% ±5.67% ±8.06%
buffers/buffer-creation.js n=600000 len=10 type='slow-allocUnsafe' -0.09 % ±2.45% ±3.37% ±4.61%
buffers/buffer-creation.js n=600000 len=1024 type='fast-alloc-fill' 1.88 % ±8.54% ±11.79% ±16.26%
buffers/buffer-creation.js n=600000 len=1024 type='fast-alloc' 2.89 % ±8.55% ±11.76% ±16.15%
buffers/buffer-creation.js n=600000 len=1024 type='fast-allocUnsafe' 0.66 % ±2.98% ±4.09% ±5.58%
buffers/buffer-creation.js n=600000 len=1024 type='slow-allocUnsafe' 2.80 % ±6.70% ±9.22% ±12.65%
buffers/buffer-creation.js n=600000 len=4096 type='fast-alloc-fill' 0.37 % ±3.85% ±5.30% ±7.28%
buffers/buffer-creation.js n=600000 len=4096 type='fast-alloc' 0.10 % ±3.19% ±4.39% ±6.04%
buffers/buffer-creation.js n=600000 len=4096 type='fast-allocUnsafe' 0.95 % ±2.04% ±2.87% ±4.07%
buffers/buffer-creation.js n=600000 len=4096 type='slow-allocUnsafe' 0.24 % ±3.38% ±4.63% ±6.31%
buffers/buffer-creation.js n=600000 len=8192 type='fast-alloc-fill' -0.92 % ±4.70% ±6.48% ±8.90%
buffers/buffer-creation.js n=600000 len=8192 type='fast-alloc' 1.32 % ±7.52% ±10.37% ±14.26%
buffers/buffer-creation.js n=600000 len=8192 type='fast-allocUnsafe' -0.73 % ±6.19% ±8.49% ±11.59%
buffers/buffer-creation.js n=600000 len=8192 type='slow-allocUnsafe' 3.44 % ±7.31% ±10.12% ±14.03%
buffers/buffer-equals.js n=1000000 difflen='false' size=0 -0.72 % ±1.13% ±1.57% ±2.18%
buffers/buffer-equals.js n=1000000 difflen='false' size=16386 0.16 % ±0.25% ±0.35% ±0.47%
buffers/buffer-equals.js n=1000000 difflen='false' size=512 ** -1.11 % ±0.74% ±1.01% ±1.39%
buffers/buffer-equals.js n=1000000 difflen='true' size=0 -0.23 % ±1.02% ±1.40% ±1.92%
buffers/buffer-equals.js n=1000000 difflen='true' size=16386 -0.97 % ±1.56% ±2.21% ±3.16%
buffers/buffer-equals.js n=1000000 difflen='true' size=512 -0.71 % ±1.58% ±2.22% ±3.15%
buffers/buffer-fill.js n=20000 size=65536 type='fill()' * -0.68 % ±0.53% ±0.74% ±1.01%
buffers/buffer-fill.js n=20000 size=65536 type='fill(0)' -0.63 % ±1.01% ±1.39% ±1.90%
buffers/buffer-fill.js n=20000 size=65536 type='fill(100)' -0.68 % ±1.60% ±2.28% ±3.29%
buffers/buffer-fill.js n=20000 size=65536 type='fill(400)' 0.51 % ±1.18% ±1.67% ±2.42%
buffers/buffer-fill.js n=20000 size=65536 type='fill(Buffer.alloc(1), 0)' -0.84 % ±2.05% ±2.85% ±3.98%
buffers/buffer-fill.js n=20000 size=65536 type='fill(t, 0, utf8)' -0.86 % ±1.44% ±2.05% ±2.99%
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buffers/buffer-swap.js n=1000000 len=64 method='swap16' aligned='true' 0.45 % ±0.72% ±0.98% ±1.34%
buffers/buffer-swap.js n=1000000 len=64 method='swap32' aligned='false' 0.12 % ±0.82% ±1.13% ±1.56%
buffers/buffer-swap.js n=1000000 len=64 method='swap32' aligned='true' -0.42 % ±0.66% ±0.91% ±1.24%
buffers/buffer-swap.js n=1000000 len=64 method='swap64' aligned='false' -0.01 % ±2.16% ±2.97% ±4.08%
buffers/buffer-swap.js n=1000000 len=64 method='swap64' aligned='true' 0.13 % ±0.75% ±1.03% ±1.41%
buffers/buffer-swap.js n=1000000 len=768 method='swap16' aligned='false' 0.73 % ±1.69% ±2.33% ±3.21%
buffers/buffer-swap.js n=1000000 len=768 method='swap16' aligned='true' 0.64 % ±1.36% ±1.87% ±2.57%
buffers/buffer-swap.js n=1000000 len=768 method='swap32' aligned='false' * 1.29 % ±1.05% ±1.44% ±1.97%
buffers/buffer-swap.js n=1000000 len=768 method='swap32' aligned='true' -2.46 % ±9.26% ±13.28% ±19.48%
buffers/buffer-swap.js n=1000000 len=768 method='swap64' aligned='false' 0.97 % ±1.35% ±1.88% ±2.63%
buffers/buffer-swap.js n=1000000 len=768 method='swap64' aligned='true' 2.08 % ±4.15% ±5.87% ±8.44%
buffers/buffer-swap.js n=1000000 len=8192 method='swap16' aligned='false' * -4.60 % ±4.59% ±6.29% ±8.56%
buffers/buffer-swap.js n=1000000 len=8192 method='swap16' aligned='true' 2.63 % ±5.59% ±8.02% ±11.79%
buffers/buffer-swap.js n=1000000 len=8192 method='swap32' aligned='false' -6.74 % ±7.03% ±9.71% ±13.42%
buffers/buffer-swap.js n=1000000 len=8192 method='swap32' aligned='true' -0.02 % ±1.74% ±2.46% ±3.50%
buffers/buffer-swap.js n=1000000 len=8192 method='swap64' aligned='false' -2.60 % ±5.74% ±7.89% ±10.80%
buffers/buffer-swap.js n=1000000 len=8192 method='swap64' aligned='true' 0.18 % ±0.90% ±1.28% ±1.83%
buffers/buffer-tojson.js len=0 n=10000 8.57 % ±24.29% ±33.27% ±45.33%
buffers/buffer-tojson.js len=256 n=10000 -1.86 % ±3.11% ±4.26% ±5.81%
buffers/buffer-tojson.js len=4096 n=10000 0.38 % ±2.13% ±2.93% ±3.99%
buffers/buffer-tostring.js n=1000000 len=1 args=0 encoding='' -0.29 % ±0.46% ±0.64% ±0.87%
buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='ascii' *** -2.87 % ±1.02% ±1.42% ±1.99%
buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='hex' * -2.88 % ±2.10% ±2.93% ±4.11%
buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='latin1' 1.16 % ±1.86% ±2.61% ±3.70%
buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='UCS-2' -0.37 % ±6.57% ±9.00% ±12.27%
buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='utf8' * 0.59 % ±0.51% ±0.70% ±0.96%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='ascii' -0.05 % ±5.73% ±8.23% ±12.09%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='hex' * -2.61 % ±2.13% ±2.92% ±3.99%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='latin1' ** 1.75 % ±1.19% ±1.67% ±2.38%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='UCS-2' -3.64 % ±5.98% ±8.21% ±11.20%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='utf8' 4.42 % ±8.73% ±12.48% ±18.23%
buffers/buffer-tostring.js n=1000000 len=1024 args=0 encoding='' 1.67 % ±2.93% ±4.05% ±5.60%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='ascii' 0.92 % ±8.34% ±11.53% ±15.90%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='hex' -1.29 % ±2.75% ±3.84% ±5.39%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='latin1' 3.45 % ±6.18% ±8.79% ±12.71%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='UCS-2' 0.82 % ±4.30% ±6.16% ±9.04%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='utf8' * 1.99 % ±1.90% ±2.62% ±3.59%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='ascii' 1.18 % ±3.41% ±4.68% ±6.39%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='hex' -0.44 % ±2.67% ±3.72% ±5.18%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='latin1' 0.57 % ±3.18% ±4.35% ±5.93%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='UCS-2' 1.76 % ±3.95% ±5.45% ±7.51%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='utf8' 2.58 % ±4.16% ±5.90% ±8.49%
buffers/buffer-tostring.js n=1000000 len=64 args=0 encoding='' *** 4.79 % ±1.27% ±1.78% ±2.52%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='ascii' -2.02 % ±2.29% ±3.13% ±4.27%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='hex' -4.68 % ±7.01% ±9.98% ±14.44%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='latin1' 0.44 % ±1.97% ±2.70% ±3.69%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='UCS-2' * 4.49 % ±3.83% ±5.46% ±7.94%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='utf8' 2.15 % ±2.18% ±2.98% ±4.06%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='ascii' -0.17 % ±4.79% ±6.72% ±9.52%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='hex' -0.37 % ±2.48% ±3.40% ±4.64%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='latin1' -4.26 % ±11.36% ±16.23% ±23.66%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='UCS-2' * 3.24 % ±2.86% ±3.94% ±5.43%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='utf8' ** 2.21 % ±1.57% ±2.15% ±2.93%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ascii' fromEncoding='ascii' 0.84 % ±6.77% ±9.27% ±12.63%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ascii' fromEncoding='latin1' 7.43 % ±21.04% ±29.80% ±42.83%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ascii' fromEncoding='ucs2' 5.38 % ±11.95% ±16.70% ±23.49%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ascii' fromEncoding='utf8' -3.97 % ±8.64% ±11.85% ±16.17%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='latin1' fromEncoding='ascii' 6.91 % ±10.16% ±14.04% ±19.40%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='latin1' fromEncoding='latin1' -2.94 % ±6.88% ±9.43% ±12.85%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='latin1' fromEncoding='ucs2' 5.13 % ±7.49% ±10.29% ±14.07%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='latin1' fromEncoding='utf8' 1.33 % ±8.04% ±11.08% ±15.22%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ucs2' fromEncoding='ascii' 1.99 % ±7.87% ±10.81% ±14.80%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ucs2' fromEncoding='latin1' 3.77 % ±9.75% ±13.36% ±18.22%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ucs2' fromEncoding='ucs2' -6.74 % ±7.49% ±10.37% ±14.35%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ucs2' fromEncoding='utf8' 2.55 % ±7.32% ±10.06% ±13.79%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='utf8' fromEncoding='ascii' 0.06 % ±7.26% ±9.97% ±13.61%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='utf8' fromEncoding='latin1' -0.87 % ±5.22% ±7.22% ±10.00%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='utf8' fromEncoding='utf8' 12.77 % ±13.73% ±19.03% ±26.42%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ascii' fromEncoding='ascii' 11.67 % ±24.60% ±34.99% ±50.65%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ascii' fromEncoding='latin1' 4.95 % ±5.46% ±7.54% ±10.39%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ascii' fromEncoding='ucs2' 3.44 % ±4.60% ±6.31% ±8.61%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ascii' fromEncoding='utf8' 3.59 % ±7.43% ±10.24% ±14.06%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='latin1' fromEncoding='ascii' 4.80 % ±6.88% ±9.50% ±13.10%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='latin1' fromEncoding='latin1' 2.57 % ±6.35% ±8.70% ±11.85%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='latin1' fromEncoding='ucs2' -0.01 % ±8.26% ±11.35% ±15.53%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='latin1' fromEncoding='utf8' -3.06 % ±8.03% ±11.00% ±14.99%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ucs2' fromEncoding='ascii' 4.85 % ±12.49% ±17.22% ±23.71%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ucs2' fromEncoding='latin1' 1.15 % ±8.27% ±11.38% ±15.59%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ucs2' fromEncoding='ucs2' -0.76 % ±6.18% ±8.50% ±11.65%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ucs2' fromEncoding='utf8' -1.40 % ±11.85% ±16.42% ±22.77%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='utf8' fromEncoding='ascii' -3.78 % ±8.36% ±11.48% ±15.70%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='utf8' fromEncoding='latin1' 1.67 % ±8.91% ±12.33% ±17.07%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='utf8' fromEncoding='utf8' 3.33 % ±15.98% ±22.10% ±30.56%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ascii' fromEncoding='ascii' 7.20 % ±13.47% ±19.26% ±28.11%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ascii' fromEncoding='latin1' -0.39 % ±4.33% ±6.01% ±8.36%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ascii' fromEncoding='ucs2' -1.70 % ±4.86% ±6.70% ±9.22%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ascii' fromEncoding='utf8' -4.31 % ±4.57% ±6.34% ±8.84%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='latin1' fromEncoding='ascii' 2.27 % ±4.57% ±6.28% ±8.58%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='latin1' fromEncoding='latin1' 3.92 % ±7.06% ±9.94% ±14.13%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='latin1' fromEncoding='ucs2' -0.88 % ±2.20% ±3.02% ±4.13%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='latin1' fromEncoding='utf8' -0.46 % ±1.85% ±2.54% ±3.46%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ucs2' fromEncoding='ascii' 0.63 % ±5.39% ±7.50% ±10.48%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ucs2' fromEncoding='latin1' 1.10 % ±3.47% ±4.75% ±6.47%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ucs2' fromEncoding='ucs2' 0.82 % ±2.89% ±4.10% ±5.92%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ucs2' fromEncoding='utf8' -0.19 % ±3.85% ±5.28% ±7.19%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='utf8' fromEncoding='ascii' 0.51 % ±3.87% ±5.32% ±7.31%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='utf8' fromEncoding='latin1' 0.48 % ±4.04% ±5.64% ±7.90%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='utf8' fromEncoding='utf8' -6.01 % ±14.36% ±20.31% ±29.13%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='ascii' 2.56 % ±4.92% ±6.94% ±9.92%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='latin1' -0.81 % ±1.42% ±1.96% ±2.70%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='utf8' -0.69 % ±2.14% ±2.94% ±4.03%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='ascii' -3.41 % ±6.29% ±8.90% ±12.77%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='latin1' -0.31 % ±3.22% ±4.41% ±6.01%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='utf8' -0.68 % ±2.76% ±3.79% ±5.16%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='ascii' 0.51 % ±2.65% ±3.63% ±4.96%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='latin1' -1.33 % ±2.14% ±2.94% ±4.02%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='utf8' -4.41 % ±5.67% ±7.97% ±11.30%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='ascii' 0.51 % ±2.74% ±3.78% ±5.19%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='latin1' -5.80 % ±9.26% ±13.16% ±19.02%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='utf8' -1.51 % ±4.29% ±5.90% ±8.11%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='' -1.03 % ±1.79% ±2.45% ±3.34%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='ascii' 0.46 % ±1.40% ±1.95% ±2.73%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='hex' 0.48 % ±2.77% ±3.84% ±5.31%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='latin1' 0.00 % ±12.08% ±16.56% ±22.59%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='utf16le' ** -4.86 % ±3.33% ±4.70% ±6.72%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='utf8' -1.49 % ±3.73% ±5.18% ±7.20%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='' * -1.17 % ±1.11% ±1.53% ±2.08%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='ascii' -0.05 % ±2.44% ±3.35% ±4.58%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='hex' -1.74 % ±2.10% ±2.91% ±4.02%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='latin1' 1.22 % ±3.35% ±4.75% ±6.82%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='utf16le' -0.45 % ±7.45% ±10.63% ±15.46%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='utf8' * -2.07 % ±1.80% ±2.49% ±3.45%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='' -1.69 % ±1.90% ±2.65% ±3.74%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='ascii' -2.70 % ±7.75% ±11.11% ±16.30%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='hex' * -2.10 % ±1.59% ±2.20% ±3.03%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='latin1' 0.84 % ±2.86% ±3.96% ±5.47%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='utf16le' * -3.12 % ±2.79% ±3.88% ±5.42%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='utf8' -1.02 % ±1.82% ±2.49% ±3.39%
buffers/buffer-write.js n=1000000 type='BigInt64BE' buffer='fast' 1.60 % ±5.58% ±7.84% ±11.13%
buffers/buffer-write.js n=1000000 type='BigInt64LE' buffer='fast' -0.04 % ±4.20% ±5.79% ±7.96%
buffers/buffer-write.js n=1000000 type='BigUInt64BE' buffer='fast' -3.06 % ±4.55% ±6.31% ±8.76%
buffers/buffer-write.js n=1000000 type='BigUInt64LE' buffer='fast' -0.58 % ±4.93% ±6.82% ±9.43%
buffers/buffer-write.js n=1000000 type='DoubleBE' buffer='fast' -0.19 % ±2.84% ±3.89% ±5.31%
buffers/buffer-write.js n=1000000 type='DoubleLE' buffer='fast' 8.25 % ±16.59% ±23.77% ±34.84%
buffers/buffer-write.js n=1000000 type='FloatBE' buffer='fast' 0.12 % ±2.95% ±4.05% ±5.56%
buffers/buffer-write.js n=1000000 type='FloatLE' buffer='fast' -0.83 % ±2.88% ±3.95% ±5.39%
buffers/buffer-write.js n=1000000 type='Int16BE' buffer='fast' -1.29 % ±2.55% ±3.62% ±5.20%
buffers/buffer-write.js n=1000000 type='Int16LE' buffer='fast' 1.93 % ±2.79% ±3.91% ±5.54%
buffers/buffer-write.js n=1000000 type='Int32BE' buffer='fast' -0.78 % ±3.70% ±5.09% ±6.98%
buffers/buffer-write.js n=1000000 type='Int32LE' buffer='fast' -0.14 % ±4.69% ±6.43% ±8.77%
buffers/buffer-write.js n=1000000 type='Int8' buffer='fast' 0.58 % ±3.33% ±4.66% ±6.57%
buffers/buffer-write.js n=1000000 type='IntBE' buffer='fast' * 2.36 % ±1.96% ±2.69% ±3.67%
buffers/buffer-write.js n=1000000 type='IntLE' buffer='fast' 0.22 % ±1.88% ±2.58% ±3.53%
buffers/buffer-write.js n=1000000 type='UInt16BE' buffer='fast' 3.07 % ±3.96% ±5.57% ±7.91%
buffers/buffer-write.js n=1000000 type='UInt16LE' buffer='fast' 1.34 % ±3.94% ±5.40% ±7.37%
buffers/buffer-write.js n=1000000 type='UInt32BE' buffer='fast' -1.69 % ±2.62% ±3.64% ±5.08%
buffers/buffer-write.js n=1000000 type='UInt32LE' buffer='fast' -1.68 % ±3.55% ±4.91% ±6.79%
buffers/buffer-write.js n=1000000 type='UInt8' buffer='fast' 8.56 % ±13.99% ±20.00% ±29.17%
buffers/buffer-write.js n=1000000 type='UIntBE' buffer='fast' -0.29 % ±3.57% ±4.94% ±6.83%
buffers/buffer-write.js n=1000000 type='UIntLE' buffer='fast' * -2.54 % ±2.50% ±3.45% ±4.74%
buffers/buffer-zero.js type='buffer' n=1000000 0.34 % ±2.89% ±3.97% ±5.43%
buffers/buffer-zero.js type='string' n=1000000 -1.99 % ±3.64% ±5.14% ±7.36%
buffers/dataview-set.js n=1000000 type='Float32BE' -5.55 % ±9.42% ±13.50% ±19.80%
buffers/dataview-set.js n=1000000 type='Float32LE' -0.89 % ±6.55% ±9.03% ±12.43%
buffers/dataview-set.js n=1000000 type='Float64BE' 6.10 % ±17.80% ±25.46% ±37.19%
buffers/dataview-set.js n=1000000 type='Float64LE' -5.14 % ±11.87% ±17.00% ±24.89%
buffers/dataview-set.js n=1000000 type='Int16BE' -0.53 % ±2.70% ±3.71% ±5.05%
buffers/dataview-set.js n=1000000 type='Int16LE' -0.04 % ±1.98% ±2.72% ±3.73%
buffers/dataview-set.js n=1000000 type='Int32BE' 3.64 % ±6.25% ±8.80% ±12.54%
buffers/dataview-set.js n=1000000 type='Int32LE' 1.00 % ±2.96% ±4.06% ±5.54%
buffers/dataview-set.js n=1000000 type='Int8' -1.75 % ±2.16% ±2.97% ±4.07%
buffers/dataview-set.js n=1000000 type='Uint16BE' 1.55 % ±2.42% ±3.32% ±4.55%
buffers/dataview-set.js n=1000000 type='Uint16LE' -0.33 % ±2.19% ±3.01% ±4.09%
buffers/dataview-set.js n=1000000 type='Uint32BE' -1.22 % ±1.92% ±2.64% ±3.61%
buffers/dataview-set.js n=1000000 type='Uint32LE' 0.10 % ±2.83% ±3.91% ±5.38%
buffers/dataview-set.js n=1000000 type='Uint8' 2.38 % ±3.74% ±5.22% ±7.32%
Be aware that when doing many comparisons the risk of a false-positive result increases.
In this case, there are 471 comparisons, you can thus expect the following amount of false-positive results:
23.55 false positives, when considering a 5% risk acceptance (*, **, ***),
4.71 false positives, when considering a 1% risk acceptance (**, ***),
0.47 false positives, when considering a 0.1% risk acceptance (***)
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Benchmark CI to see what this currently looks like: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1751/ Edit: Results: in the fold |
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btw, this failure in the Github CI seems related: |
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| eval('%OptimizeFunctionOnNextCall(Buffer.prototype.utf8Write)'); | ||
| eval('%OptimizeFunctionOnNextCall(utf8Write)'); |
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For the same reason this test was changed: https://github.com/nodejs/node/pull/56578/files#r1917498109
No longer do we rely on neighboring prototype methods as the helpers to support other methods, "writeString" is going to call a floating function "utf8Write" in the buffer module so that it can still work when "this" is a Uint8Array and not a Buffer.
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Def need to open these in a new tab and zooooooooom Visualizing the results of the CI runJust the significant negatives
The negatives (considering error bar)
All results
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Removes the reliance on prototype bound methods internally so that Uint8Arrays can be set as the bound `this` value when calling the various Buffer methods. Introduces some additional tamper protection by removing internal reliance on writable properties. Fixes: nodejs#56577
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I'm good with this in its current state.
Full disclosure: @nbbeeken and me are coworkers, so I'll ping @nodejs/buffer and apply the review wanted label in case somebody else would like to take a look
CI: https://ci.nodejs.org/job/node-test-pull-request/70455/ (💛)
Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1771/
Edit: Longer Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1772/
Benchmark CI results
buffers/buffer-atob.js n=1000000 size=128 -0.66 % ±0.84% ±1.10% ±1.42%
buffers/buffer-atob.js n=1000000 size=16 * -0.81 % ±0.68% ±0.89% ±1.14%
buffers/buffer-atob.js n=1000000 size=32 * 0.76 % ±0.74% ±0.98% ±1.26%
buffers/buffer-atob.js n=1000000 size=64 ** 1.22 % ±0.72% ±0.95% ±1.22%
buffers/buffer-base64-decode-wrapped.js n=32 linesCount=524288 charsPerLine=76 -0.00 % ±0.33% ±0.43% ±0.55%
buffers/buffer-base64-decode.js size=8388608 n=32 -0.04 % ±0.07% ±0.09% ±0.11%
buffers/buffer-base64-encode.js n=32 len=67108864 -0.02 % ±0.05% ±0.06% ±0.08%
buffers/buffer-base64url-decode.js size=8388608 n=32 *** -0.12 % ±0.07% ±0.09% ±0.12%
buffers/buffer-base64url-encode.js n=32 len=67108864 -0.01 % ±0.05% ±0.06% ±0.08%
buffers/buffer-btoa.js n=1000000 size=1024 *** -1.79 % ±0.30% ±0.40% ±0.51%
buffers/buffer-btoa.js n=1000000 size=128 *** -2.21 % ±0.78% ±1.02% ±1.31%
buffers/buffer-btoa.js n=1000000 size=16 *** -2.45 % ±0.73% ±0.96% ±1.23%
buffers/buffer-btoa.js n=1000000 size=256 * -0.91 % ±0.78% ±1.03% ±1.32%
buffers/buffer-btoa.js n=1000000 size=32 *** -1.83 % ±0.92% ±1.22% ±1.56%
buffers/buffer-btoa.js n=1000000 size=64 *** -1.86 % ±0.80% ±1.06% ±1.36%
buffers/buffer-bytelength-buffer.js n=4000000 len=16 -0.03 % ±1.07% ±1.41% ±1.81%
buffers/buffer-bytelength-buffer.js n=4000000 len=2 -0.50 % ±1.00% ±1.32% ±1.69%
buffers/buffer-bytelength-buffer.js n=4000000 len=256 -0.73 % ±1.04% ±1.37% ±1.75%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='four_bytes' 0.37 % ±1.24% ±1.64% ±2.10%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='latin1' 0.90 % ±1.22% ±1.61% ±2.06%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='one_byte' 0.76 % ±1.23% ±1.61% ±2.07%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='three_bytes' -0.60 % ±1.23% ±1.62% ±2.07%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='base64' type='two_bytes' * 1.38 % ±1.29% ±1.70% ±2.18%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='four_bytes' *** 6.86 % ±0.53% ±0.70% ±0.89%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='latin1' *** 2.64 % ±1.06% ±1.40% ±1.79%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='one_byte' * 1.20 % ±0.96% ±1.27% ±1.62%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='three_bytes' *** 17.84 % ±0.54% ±0.71% ±0.91%
buffers/buffer-bytelength-string.js n=4000000 repeat=1 encoding='utf8' type='two_bytes' 0.72 % ±0.85% ±1.12% ±1.44%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='four_bytes' -0.54 % ±1.28% ±1.69% ±2.16%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='latin1' 0.53 % ±1.25% ±1.65% ±2.11%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='one_byte' 0.06 % ±1.28% ±1.68% ±2.16%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='three_bytes' 0.47 % ±1.23% ±1.62% ±2.08%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='base64' type='two_bytes' -0.60 % ±1.32% ±1.73% ±2.22%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='four_bytes' 0.04 % ±0.04% ±0.05% ±0.07%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='latin1' * 0.43 % ±0.40% ±0.52% ±0.67%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='one_byte' *** 3.77 % ±1.23% ±1.62% ±2.07%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='three_bytes' *** 2.41 % ±0.09% ±0.12% ±0.15%
buffers/buffer-bytelength-string.js n=4000000 repeat=16 encoding='utf8' type='two_bytes' *** 1.58 % ±0.09% ±0.12% ±0.16%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='four_bytes' * 1.48 % ±1.25% ±1.65% ±2.11%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='latin1' -0.11 % ±1.27% ±1.67% ±2.14%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='one_byte' 0.47 % ±1.40% ±1.85% ±2.36%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='three_bytes' 0.41 % ±1.12% ±1.47% ±1.89%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='base64' type='two_bytes' -0.19 % ±1.24% ±1.63% ±2.08%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='four_bytes' *** 2.11 % ±0.25% ±0.33% ±0.42%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='latin1' *** 4.28 % ±1.25% ±1.64% ±2.10%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='one_byte' *** 4.40 % ±1.48% ±1.95% ±2.50%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='three_bytes' *** 10.69 % ±0.83% ±1.10% ±1.41%
buffers/buffer-bytelength-string.js n=4000000 repeat=2 encoding='utf8' type='two_bytes' *** -1.53 % ±0.79% ±1.04% ±1.33%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='four_bytes' 0.66 % ±1.30% ±1.72% ±2.20%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='latin1' 0.04 % ±1.20% ±1.58% ±2.02%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='one_byte' 0.09 % ±1.18% ±1.56% ±1.99%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='three_bytes' ** 1.82 % ±1.23% ±1.62% ±2.07%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='base64' type='two_bytes' -0.35 % ±1.33% ±1.75% ±2.24%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='four_bytes' *** -0.04 % ±0.01% ±0.01% ±0.01%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='latin1' -0.14 % ±0.28% ±0.36% ±0.47%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='one_byte' 0.15 % ±0.64% ±0.85% ±1.09%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='three_bytes' *** 3.46 % ±0.04% ±0.05% ±0.06%
buffers/buffer-bytelength-string.js n=4000000 repeat=256 encoding='utf8' type='two_bytes' *** 1.90 % ±0.04% ±0.05% ±0.07%
buffers/buffer-compare-instance-method.js n=1000000 args=1 size=16 *** -7.30 % ±1.37% ±1.80% ±2.31%
buffers/buffer-compare-instance-method.js n=1000000 args=1 size=16386 *** -8.41 % ±1.55% ±2.04% ±2.62%
buffers/buffer-compare-instance-method.js n=1000000 args=1 size=4096 ** -2.59 % ±1.62% ±2.13% ±2.73%
buffers/buffer-compare-instance-method.js n=1000000 args=1 size=512 *** -4.22 % ±1.76% ±2.31% ±2.96%
buffers/buffer-compare-instance-method.js n=1000000 args=2 size=16 * 1.06 % ±1.01% ±1.33% ±1.70%
buffers/buffer-compare-instance-method.js n=1000000 args=2 size=16386 *** -9.11 % ±1.78% ±2.35% ±3.01%
buffers/buffer-compare-instance-method.js n=1000000 args=2 size=4096 * -1.83 % ±1.49% ±1.96% ±2.51%
buffers/buffer-compare-instance-method.js n=1000000 args=2 size=512 *** -2.28 % ±1.03% ±1.36% ±1.74%
buffers/buffer-compare-instance-method.js n=1000000 args=5 size=16 * 1.55 % ±1.35% ±1.78% ±2.28%
buffers/buffer-compare-instance-method.js n=1000000 args=5 size=16386 *** -7.65 % ±1.88% ±2.47% ±3.17%
buffers/buffer-compare-instance-method.js n=1000000 args=5 size=4096 *** -2.41 % ±1.40% ±1.85% ±2.37%
buffers/buffer-compare-instance-method.js n=1000000 args=5 size=512 ** -2.05 % ±1.37% ±1.80% ±2.31%
buffers/buffer-compare-offset.js n=1000000 size=16 method='offset' 0.69 % ±0.76% ±1.00% ±1.28%
buffers/buffer-compare-offset.js n=1000000 size=16 method='slice' *** -4.91 % ±0.67% ±0.88% ±1.12%
buffers/buffer-compare-offset.js n=1000000 size=16386 method='offset' *** -1.41 % ±0.79% ±1.04% ±1.34%
buffers/buffer-compare-offset.js n=1000000 size=16386 method='slice' *** -4.89 % ±0.77% ±1.02% ±1.30%
buffers/buffer-compare-offset.js n=1000000 size=4096 method='offset' *** -1.86 % ±0.86% ±1.13% ±1.45%
buffers/buffer-compare-offset.js n=1000000 size=4096 method='slice' *** -5.16 % ±0.71% ±0.94% ±1.20%
buffers/buffer-compare-offset.js n=1000000 size=512 method='offset' *** -1.48 % ±0.75% ±0.98% ±1.26%
buffers/buffer-compare-offset.js n=1000000 size=512 method='slice' *** -4.48 % ±0.75% ±0.99% ±1.26%
buffers/buffer-compare.js n=1000000 size=16 *** -3.84 % ±0.93% ±1.22% ±1.56%
buffers/buffer-compare.js n=1000000 size=16386 0.41 % ±0.49% ±0.65% ±0.83%
buffers/buffer-compare.js n=1000000 size=4096 *** -4.37 % ±0.98% ±1.29% ±1.65%
buffers/buffer-compare.js n=1000000 size=512 *** -3.49 % ±0.88% ±1.15% ±1.48%
buffers/buffer-concat-fill.js n=800000 extraSize=1 -0.05 % ±0.35% ±0.46% ±0.59%
buffers/buffer-concat-fill.js n=800000 extraSize=1024 -0.03 % ±0.32% ±0.42% ±0.53%
buffers/buffer-concat-fill.js n=800000 extraSize=256 0.16 % ±0.32% ±0.42% ±0.54%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=16 -0.03 % ±0.51% ±0.68% ±0.87%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=1 pieces=4 0.20 % ±0.75% ±0.98% ±1.26%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=16 * -0.49 % ±0.45% ±0.60% ±0.76%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=16 pieces=4 -0.17 % ±0.72% ±0.95% ±1.22%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=16 * -0.35 % ±0.28% ±0.36% ±0.47%
buffers/buffer-concat.js n=800000 withTotalLength=0 pieceSize=256 pieces=4 0.10 % ±0.41% ±0.54% ±0.70%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=16 *** 0.89 % ±0.47% ±0.62% ±0.80%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=1 pieces=4 *** -1.31 % ±0.66% ±0.88% ±1.12%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=16 *** 1.46 % ±0.51% ±0.67% ±0.86%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=16 pieces=4 -0.71 % ±0.78% ±1.03% ±1.32%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=16 *** -0.58 % ±0.28% ±0.37% ±0.48%
buffers/buffer-concat.js n=800000 withTotalLength=1 pieceSize=256 pieces=4 *** -0.83 % ±0.39% ±0.52% ±0.66%
buffers/buffer-copy.js n=6000000 partial='false' bytes=1024 0.49 % ±0.76% ±1.00% ±1.29%
buffers/buffer-copy.js n=6000000 partial='false' bytes=128 -0.32 % ±1.03% ±1.35% ±1.73%
buffers/buffer-copy.js n=6000000 partial='false' bytes=8 * 1.26 % ±1.02% ±1.34% ±1.71%
buffers/buffer-copy.js n=6000000 partial='true' bytes=1024 *** -0.54 % ±0.30% ±0.39% ±0.50%
buffers/buffer-copy.js n=6000000 partial='true' bytes=128 *** -6.72 % ±0.30% ±0.40% ±0.51%
buffers/buffer-copy.js n=6000000 partial='true' bytes=8 *** -7.99 % ±0.39% ±0.52% ±0.66%
buffers/buffer-creation.js n=600000 len=10 type='fast-alloc-fill' *** -4.50 % ±1.82% ±2.39% ±3.07%
buffers/buffer-creation.js n=600000 len=10 type='fast-alloc' *** -4.25 % ±1.93% ±2.54% ±3.25%
buffers/buffer-creation.js n=600000 len=10 type='fast-allocUnsafe' -1.91 % ±2.19% ±2.88% ±3.70%
buffers/buffer-creation.js n=600000 len=10 type='slow-allocUnsafe' *** -2.67 % ±1.39% ±1.82% ±2.34%
buffers/buffer-creation.js n=600000 len=1024 type='fast-alloc-fill' *** -1.17 % ±0.31% ±0.40% ±0.52%
buffers/buffer-creation.js n=600000 len=1024 type='fast-alloc' *** -1.10 % ±0.31% ±0.41% ±0.53%
buffers/buffer-creation.js n=600000 len=1024 type='fast-allocUnsafe' *** -1.20 % ±0.59% ±0.77% ±0.99%
buffers/buffer-creation.js n=600000 len=1024 type='slow-allocUnsafe' *** -1.57 % ±0.31% ±0.40% ±0.52%
buffers/buffer-creation.js n=600000 len=4096 type='fast-alloc-fill' * -0.38 % ±0.31% ±0.40% ±0.52%
buffers/buffer-creation.js n=600000 len=4096 type='fast-alloc' -0.11 % ±0.30% ±0.40% ±0.51%
buffers/buffer-creation.js n=600000 len=4096 type='fast-allocUnsafe' *** -1.41 % ±0.30% ±0.40% ±0.51%
buffers/buffer-creation.js n=600000 len=4096 type='slow-allocUnsafe' *** -1.56 % ±0.33% ±0.44% ±0.56%
buffers/buffer-creation.js n=600000 len=8192 type='fast-alloc-fill' -0.14 % ±0.28% ±0.37% ±0.47%
buffers/buffer-creation.js n=600000 len=8192 type='fast-alloc' 0.13 % ±0.31% ±0.41% ±0.53%
buffers/buffer-creation.js n=600000 len=8192 type='fast-allocUnsafe' *** -1.33 % ±0.33% ±0.44% ±0.56%
buffers/buffer-creation.js n=600000 len=8192 type='slow-allocUnsafe' *** -0.79 % ±0.35% ±0.46% ±0.60%
buffers/buffer-equals.js n=1000000 difflen='false' size=0 -0.34 % ±0.73% ±0.96% ±1.23%
buffers/buffer-equals.js n=1000000 difflen='false' size=16386 -0.40 % ±0.48% ±0.63% ±0.80%
buffers/buffer-equals.js n=1000000 difflen='false' size=512 *** -3.35 % ±0.80% ±1.06% ±1.35%
buffers/buffer-equals.js n=1000000 difflen='true' size=0 -0.51 % ±0.89% ±1.17% ±1.50%
buffers/buffer-equals.js n=1000000 difflen='true' size=16386 0.58 % ±1.09% ±1.43% ±1.84%
buffers/buffer-equals.js n=1000000 difflen='true' size=512 0.43 % ±0.59% ±0.78% ±1.00%
buffers/buffer-fill.js n=20000 size=65536 type='fill("")' *** -6.27 % ±1.49% ±1.96% ±2.52%
buffers/buffer-fill.js n=20000 size=65536 type='fill("t", "utf8")' *** -7.11 % ±1.74% ±2.30% ±2.95%
buffers/buffer-fill.js n=20000 size=65536 type='fill("t", 0, "utf8")' *** -10.27 % ±1.71% ±2.26% ±2.89%
buffers/buffer-fill.js n=20000 size=65536 type='fill("t", 0)' 0.39 % ±0.78% ±1.02% ±1.31%
buffers/buffer-fill.js n=20000 size=65536 type='fill("t")' *** -4.41 % ±1.72% ±2.27% ±2.91%
buffers/buffer-fill.js n=20000 size=65536 type='fill("test")' *** -7.51 % ±1.79% ±2.36% ±3.02%
buffers/buffer-fill.js n=20000 size=65536 type='fill(0)' ** -0.88 % ±0.64% ±0.85% ±1.09%
buffers/buffer-fill.js n=20000 size=65536 type='fill(100)' -0.35 % ±0.76% ±1.00% ±1.29%
buffers/buffer-fill.js n=20000 size=65536 type='fill(400)' * 0.89 % ±0.76% ±1.00% ±1.29%
buffers/buffer-fill.js n=20000 size=65536 type='fill(Buffer.alloc(1), 0)' *** -6.51 % ±1.59% ±2.09% ±2.69%
buffers/buffer-fill.js n=20000 size=8192 type='fill("")' *** -21.72 % ±5.12% ±6.75% ±8.65%
buffers/buffer-fill.js n=20000 size=8192 type='fill("t", "utf8")' *** -20.96 % ±4.54% ±5.98% ±7.67%
buffers/buffer-fill.js n=20000 size=8192 type='fill("t", 0, "utf8")' *** -18.56 % ±4.86% ±6.41% ±8.21%
buffers/buffer-fill.js n=20000 size=8192 type='fill("t", 0)' *** -23.83 % ±4.25% ±5.61% ±7.19%
buffers/buffer-fill.js n=20000 size=8192 type='fill("t")' *** -24.04 % ±4.83% ±6.37% ±8.16%
buffers/buffer-fill.js n=20000 size=8192 type='fill("test")' *** -25.09 % ±4.10% ±5.40% ±6.93%
buffers/buffer-fill.js n=20000 size=8192 type='fill(0)' * 0.88 % ±0.72% ±0.95% ±1.22%
buffers/buffer-fill.js n=20000 size=8192 type='fill(100)' *** 2.26 % ±1.01% ±1.33% ±1.70%
buffers/buffer-fill.js n=20000 size=8192 type='fill(400)' 0.37 % ±1.37% ±1.81% ±2.32%
buffers/buffer-fill.js n=20000 size=8192 type='fill(Buffer.alloc(1), 0)' *** -8.16 % ±3.87% ±5.10% ±6.53%
buffers/buffer-from.js n=800000 len=100 source='array' -0.09 % ±0.45% ±0.59% ±0.76%
buffers/buffer-from.js n=800000 len=100 source='arraybuffer-middle' *** -3.70 % ±1.73% ±2.28% ±2.92%
buffers/buffer-from.js n=800000 len=100 source='arraybuffer' * -2.12 % ±1.72% ±2.27% ±2.91%
buffers/buffer-from.js n=800000 len=100 source='buffer' *** -1.92 % ±1.09% ±1.44% ±1.84%
buffers/buffer-from.js n=800000 len=100 source='object' *** -2.68 % ±1.44% ±1.90% ±2.43%
buffers/buffer-from.js n=800000 len=100 source='string-base64' *** -3.63 % ±0.49% ±0.65% ±0.83%
buffers/buffer-from.js n=800000 len=100 source='string-utf8' *** -4.41 % ±0.81% ±1.06% ±1.36%
buffers/buffer-from.js n=800000 len=100 source='string' *** -3.62 % ±0.78% ±1.03% ±1.32%
buffers/buffer-from.js n=800000 len=100 source='uint16array' ** 1.27 % ±0.84% ±1.10% ±1.41%
buffers/buffer-from.js n=800000 len=100 source='uint8array' -1.11 % ±1.16% ±1.52% ±1.95%
buffers/buffer-from.js n=800000 len=2048 source='array' *** 0.29 % ±0.10% ±0.13% ±0.16%
buffers/buffer-from.js n=800000 len=2048 source='arraybuffer-middle' *** -3.12 % ±1.71% ±2.25% ±2.88%
buffers/buffer-from.js n=800000 len=2048 source='arraybuffer' -1.24 % ±1.88% ±2.47% ±3.17%
buffers/buffer-from.js n=800000 len=2048 source='buffer' *** -0.67 % ±0.37% ±0.48% ±0.62%
buffers/buffer-from.js n=800000 len=2048 source='object' * -1.99 % ±1.79% ±2.36% ±3.03%
buffers/buffer-from.js n=800000 len=2048 source='string-base64' 0.21 % ±0.30% ±0.39% ±0.51%
buffers/buffer-from.js n=800000 len=2048 source='string-utf8' -0.14 % ±0.35% ±0.46% ±0.59%
buffers/buffer-from.js n=800000 len=2048 source='string' *** -1.08 % ±0.37% ±0.49% ±0.63%
buffers/buffer-from.js n=800000 len=2048 source='uint16array' 0.31 % ±0.32% ±0.42% ±0.54%
buffers/buffer-from.js n=800000 len=2048 source='uint8array' *** 0.93 % ±0.42% ±0.55% ±0.71%
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buffers/buffer-read.js n=1000000 type='Int32LE' buffer='fast' * -10.89 % ±8.27% ±10.89% ±13.96%
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buffers/buffer-read.js n=1000000 type='UInt16BE' buffer='fast' *** -30.15 % ±6.73% ±8.87% ±11.36%
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buffers/buffer-tojson.js len=256 n=10000 *** -6.68 % ±2.86% ±3.77% ±4.83%
buffers/buffer-tojson.js len=4096 n=10000 *** -3.43 % ±0.86% ±1.13% ±1.45%
buffers/buffer-tostring.js n=1000000 len=1 args=0 encoding='' 0.71 % ±1.15% ±1.51% ±1.94%
buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='ascii' -0.31 % ±1.35% ±1.77% ±2.27%
buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='hex' *** 8.00 % ±1.10% ±1.45% ±1.86%
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buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='UCS-2' 0.68 % ±0.82% ±1.09% ±1.39%
buffers/buffer-tostring.js n=1000000 len=1 args=1 encoding='utf8' *** 2.76 % ±1.22% ±1.61% ±2.06%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='ascii' *** -2.62 % ±1.34% ±1.76% ±2.26%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='hex' *** 4.47 % ±1.10% ±1.45% ±1.85%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='latin1' *** 8.43 % ±1.51% ±1.99% ±2.55%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='UCS-2' *** 3.74 % ±0.92% ±1.21% ±1.55%
buffers/buffer-tostring.js n=1000000 len=1 args=3 encoding='utf8' -1.02 % ±1.27% ±1.68% ±2.15%
buffers/buffer-tostring.js n=1000000 len=1024 args=0 encoding='' *** -4.19 % ±0.37% ±0.48% ±0.62%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='ascii' *** -6.06 % ±0.45% ±0.59% ±0.76%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='hex' *** -2.12 % ±0.16% ±0.21% ±0.27%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='latin1' *** -5.43 % ±0.53% ±0.69% ±0.89%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='UCS-2' *** -3.45 % ±0.41% ±0.54% ±0.69%
buffers/buffer-tostring.js n=1000000 len=1024 args=1 encoding='utf8' *** -4.26 % ±0.36% ±0.47% ±0.60%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='ascii' *** -5.33 % ±0.49% ±0.65% ±0.83%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='hex' *** -1.29 % ±0.42% ±0.56% ±0.71%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='latin1' *** -5.42 % ±0.56% ±0.73% ±0.94%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='UCS-2' *** -2.11 % ±0.44% ±0.58% ±0.74%
buffers/buffer-tostring.js n=1000000 len=1024 args=3 encoding='utf8' *** -4.34 % ±0.40% ±0.53% ±0.68%
buffers/buffer-tostring.js n=1000000 len=64 args=0 encoding='' *** -2.16 % ±0.85% ±1.12% ±1.43%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='ascii' *** -1.60 % ±0.83% ±1.09% ±1.40%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='hex' *** 8.25 % ±0.59% ±0.78% ±1.00%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='latin1' *** 5.97 % ±1.15% ±1.52% ±1.95%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='UCS-2' 0.14 % ±0.74% ±0.98% ±1.25%
buffers/buffer-tostring.js n=1000000 len=64 args=1 encoding='utf8' *** 2.07 % ±0.88% ±1.16% ±1.48%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='ascii' *** -4.91 % ±0.84% ±1.11% ±1.42%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='hex' *** 8.31 % ±0.59% ±0.78% ±0.99%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='latin1' *** 6.58 % ±0.98% ±1.29% ±1.65%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='UCS-2' 0.67 % ±0.67% ±0.89% ±1.14%
buffers/buffer-tostring.js n=1000000 len=64 args=3 encoding='utf8' *** 2.20 % ±0.76% ±1.01% ±1.29%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ascii' fromEncoding='ascii' *** -1.20 % ±0.64% ±0.85% ±1.08%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ascii' fromEncoding='latin1' *** -1.76 % ±0.66% ±0.87% ±1.12%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ascii' fromEncoding='ucs2' -0.75 % ±0.93% ±1.23% ±1.57%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ascii' fromEncoding='utf8' *** -1.55 % ±0.78% ±1.03% ±1.32%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='latin1' fromEncoding='ascii' *** -2.00 % ±0.63% ±0.83% ±1.07%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='latin1' fromEncoding='latin1' *** -2.79 % ±0.46% ±0.61% ±0.78%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='latin1' fromEncoding='ucs2' *** -1.50 % ±0.87% ±1.15% ±1.47%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='latin1' fromEncoding='utf8' *** -1.07 % ±0.63% ±0.83% ±1.06%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ucs2' fromEncoding='ascii' 0.37 % ±0.75% ±0.99% ±1.26%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ucs2' fromEncoding='latin1' -0.19 % ±0.76% ±1.00% ±1.28%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ucs2' fromEncoding='ucs2' *** -1.51 % ±0.73% ±0.96% ±1.22%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='ucs2' fromEncoding='utf8' -0.18 % ±0.70% ±0.92% ±1.18%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='utf8' fromEncoding='ascii' ** -0.86 % ±0.62% ±0.82% ±1.04%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='utf8' fromEncoding='latin1' *** -2.16 % ±0.51% ±0.67% ±0.86%
buffers/buffer-transcode.js n=100000 length=1 toEncoding='utf8' fromEncoding='utf8' 0.02 % ±0.54% ±0.71% ±0.90%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ascii' fromEncoding='ascii' *** -2.62 % ±0.65% ±0.86% ±1.10%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ascii' fromEncoding='latin1' *** -2.00 % ±0.68% ±0.89% ±1.14%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ascii' fromEncoding='ucs2' * -0.88 % ±0.73% ±0.96% ±1.22%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ascii' fromEncoding='utf8' ** -1.09 % ±0.79% ±1.04% ±1.33%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='latin1' fromEncoding='ascii' *** -2.14 % ±0.65% ±0.86% ±1.10%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='latin1' fromEncoding='latin1' *** -2.59 % ±0.53% ±0.70% ±0.89%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='latin1' fromEncoding='ucs2' *** -1.95 % ±0.70% ±0.92% ±1.18%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='latin1' fromEncoding='utf8' *** -1.12 % ±0.62% ±0.82% ±1.05%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ucs2' fromEncoding='ascii' 0.34 % ±0.74% ±0.98% ±1.25%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ucs2' fromEncoding='latin1' ** -1.31 % ±0.78% ±1.03% ±1.32%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ucs2' fromEncoding='ucs2' *** -1.43 % ±0.69% ±0.91% ±1.17%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='ucs2' fromEncoding='utf8' ** -1.23 % ±0.75% ±0.98% ±1.26%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='utf8' fromEncoding='ascii' * -0.86 % ±0.75% ±0.99% ±1.27%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='utf8' fromEncoding='latin1' *** -2.70 % ±0.66% ±0.88% ±1.12%
buffers/buffer-transcode.js n=100000 length=10 toEncoding='utf8' fromEncoding='utf8' * -0.83 % ±0.72% ±0.95% ±1.22%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ascii' fromEncoding='ascii' * -0.49 % ±0.42% ±0.55% ±0.70%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ascii' fromEncoding='latin1' *** -1.42 % ±0.46% ±0.61% ±0.78%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ascii' fromEncoding='ucs2' 0.08 % ±0.12% ±0.15% ±0.20%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ascii' fromEncoding='utf8' *** -0.94 % ±0.55% ±0.72% ±0.92%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='latin1' fromEncoding='ascii' ** -0.54 % ±0.40% ±0.52% ±0.67%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='latin1' fromEncoding='latin1' *** -1.33 % ±0.41% ±0.54% ±0.69%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='latin1' fromEncoding='ucs2' *** 0.32 % ±0.10% ±0.13% ±0.16%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='latin1' fromEncoding='utf8' -0.15 % ±0.41% ±0.54% ±0.69%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ucs2' fromEncoding='ascii' -0.29 % ±0.43% ±0.57% ±0.73%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ucs2' fromEncoding='latin1' -0.15 % ±0.42% ±0.56% ±0.71%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ucs2' fromEncoding='ucs2' *** -1.28 % ±0.36% ±0.48% ±0.61%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='ucs2' fromEncoding='utf8' -0.35 % ±0.43% ±0.56% ±0.72%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='utf8' fromEncoding='ascii' -0.05 % ±0.36% ±0.47% ±0.60%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='utf8' fromEncoding='latin1' 0.00 % ±0.34% ±0.45% ±0.58%
buffers/buffer-transcode.js n=100000 length=1000 toEncoding='utf8' fromEncoding='utf8' 0.25 % ±0.35% ±0.46% ±0.59%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='ascii' *** -4.28 % ±2.14% ±2.82% ±3.61%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='latin1' *** -3.81 % ±1.90% ±2.51% ±3.21%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='utf8' * -2.04 % ±1.90% ±2.50% ±3.20%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='ascii' *** -6.92 % ±2.08% ±2.74% ±3.51%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='latin1' *** -5.24 % ±1.93% ±2.54% ±3.26%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='utf8' ** -3.32 % ±2.01% ±2.65% ±3.39%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='ascii' *** -6.74 % ±2.20% ±2.89% ±3.70%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='latin1' *** -5.84 % ±1.97% ±2.59% ±3.32%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='utf8' ** -2.64 % ±1.94% ±2.55% ±3.27%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='ascii' *** -5.09 % ±2.21% ±2.91% ±3.73%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='latin1' *** -5.35 % ±1.76% ±2.31% ±2.97%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='utf8' *** -3.51 % ±1.59% ±2.09% ±2.68%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='' *** 2.01 % ±0.22% ±0.30% ±0.38%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='ascii' *** -11.61 % ±0.47% ±0.62% ±0.80%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='hex' *** -1.34 % ±0.08% ±0.10% ±0.13%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='latin1' *** 4.08 % ±0.72% ±0.95% ±1.22%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='utf16le' *** 3.44 % ±0.61% ±0.81% ±1.03%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='utf8' *** 3.12 % ±0.20% ±0.26% ±0.34%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='' ** -0.92 % ±0.69% ±0.91% ±1.17%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='ascii' -1.11 % ±1.67% ±2.20% ±2.82%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='hex' *** -2.64 % ±0.20% ±0.27% ±0.35%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='latin1' *** -4.95 % ±1.60% ±2.11% ±2.71%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='utf16le' *** 1.55 % ±0.86% ±1.13% ±1.45%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='utf8' ** -1.06 % ±0.70% ±0.93% ±1.19%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='' * -0.58 % ±0.50% ±0.65% ±0.84%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='ascii' *** -8.70 % ±1.22% ±1.60% ±2.05%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='hex' *** -0.91 % ±0.12% ±0.15% ±0.19%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='latin1' *** 5.77 % ±1.25% ±1.64% ±2.10%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='utf16le' *** 4.17 % ±0.97% ±1.28% ±1.64%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='utf8' *** -1.21 % ±0.54% ±0.71% ±0.91%
buffers/buffer-write.js n=1000000 type='BigInt64BE' buffer='fast' *** -2.31 % ±0.77% ±1.02% ±1.30%
buffers/buffer-write.js n=1000000 type='BigInt64LE' buffer='fast' *** -1.93 % ±0.71% ±0.94% ±1.20%
buffers/buffer-write.js n=1000000 type='BigUInt64BE' buffer='fast' *** -2.55 % ±0.73% ±0.95% ±1.22%
buffers/buffer-write.js n=1000000 type='BigUInt64LE' buffer='fast' ** -1.01 % ±0.64% ±0.84% ±1.08%
buffers/buffer-write.js n=1000000 type='DoubleBE' buffer='fast' -5.04 % ±6.10% ±8.03% ±10.29%
buffers/buffer-write.js n=1000000 type='DoubleLE' buffer='fast' -3.86 % ±6.08% ±8.01% ±10.26%
buffers/buffer-write.js n=1000000 type='FloatBE' buffer='fast' -5.81 % ±6.76% ±8.91% ±11.41%
buffers/buffer-write.js n=1000000 type='FloatLE' buffer='fast' * -8.23 % ±6.52% ±8.59% ±11.01%
buffers/buffer-write.js n=1000000 type='Int16BE' buffer='fast' -0.64 % ±6.04% ±7.96% ±10.19%
buffers/buffer-write.js n=1000000 type='Int16LE' buffer='fast' ** -8.35 % ±5.85% ±7.70% ±9.87%
buffers/buffer-write.js n=1000000 type='Int32BE' buffer='fast' * -8.17 % ±6.84% ±9.01% ±11.54%
buffers/buffer-write.js n=1000000 type='Int32LE' buffer='fast' -6.70 % ±6.86% ±9.03% ±11.57%
buffers/buffer-write.js n=1000000 type='Int8' buffer='fast' *** -16.44 % ±5.42% ±7.14% ±9.15%
buffers/buffer-write.js n=1000000 type='IntBE' buffer='fast' *** -10.08 % ±4.06% ±5.34% ±6.84%
buffers/buffer-write.js n=1000000 type='IntLE' buffer='fast' *** -7.77 % ±4.33% ±5.70% ±7.30%
buffers/buffer-write.js n=1000000 type='UInt16BE' buffer='fast' 0.19 % ±6.13% ±8.07% ±10.34%
buffers/buffer-write.js n=1000000 type='UInt16LE' buffer='fast' -0.77 % ±6.19% ±8.15% ±10.44%
buffers/buffer-write.js n=1000000 type='UInt32BE' buffer='fast' -2.71 % ±5.18% ±6.82% ±8.73%
buffers/buffer-write.js n=1000000 type='UInt32LE' buffer='fast' -3.89 % ±5.03% ±6.62% ±8.48%
buffers/buffer-write.js n=1000000 type='UInt8' buffer='fast' ** -9.44 % ±6.21% ±8.18% ±10.48%
buffers/buffer-write.js n=1000000 type='UIntBE' buffer='fast' *** -9.69 % ±4.84% ±6.38% ±8.17%
buffers/buffer-write.js n=1000000 type='UIntLE' buffer='fast' *** -17.00 % ±5.07% ±6.68% ±8.56%
buffers/buffer-zero.js type='buffer' n=1000000 *** -2.42 % ±0.94% ±1.24% ±1.59%
buffers/buffer-zero.js type='string' n=1000000 *** -3.78 % ±1.47% ±1.94% ±2.49%
buffers/dataview-set.js n=1000000 type='Float32BE' ** 6.33 % ±3.94% ±5.19% ±6.65%
buffers/dataview-set.js n=1000000 type='Float32LE' 1.34 % ±3.72% ±4.90% ±6.28%
buffers/dataview-set.js n=1000000 type='Float64BE' -1.35 % ±3.59% ±4.73% ±6.06%
buffers/dataview-set.js n=1000000 type='Float64LE' 0.15 % ±3.52% ±4.64% ±5.95%
buffers/dataview-set.js n=1000000 type='Int16BE' -0.94 % ±1.68% ±2.21% ±2.84%
buffers/dataview-set.js n=1000000 type='Int16LE' 0.48 % ±1.67% ±2.20% ±2.82%
buffers/dataview-set.js n=1000000 type='Int32BE' 0.68 % ±1.38% ±1.81% ±2.32%
buffers/dataview-set.js n=1000000 type='Int32LE' 0.04 % ±1.47% ±1.94% ±2.49%
buffers/dataview-set.js n=1000000 type='Int8' 0.78 % ±0.84% ±1.10% ±1.41%
buffers/dataview-set.js n=1000000 type='Uint16BE' -0.86 % ±1.18% ±1.55% ±1.99%
buffers/dataview-set.js n=1000000 type='Uint16LE' 0.11 % ±1.20% ±1.58% ±2.03%
buffers/dataview-set.js n=1000000 type='Uint32BE' -0.25 % ±1.07% ±1.41% ±1.81%
buffers/dataview-set.js n=1000000 type='Uint32LE' 0.09 % ±1.09% ±1.44% ±1.84%
buffers/dataview-set.js n=1000000 type='Uint8' -0.04 % ±0.90% ±1.18% ±1.52%
Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case, there are 471 comparisons, you can thus
expect the following amount of false-positive results:
23.55 false positives, when considering a 5% risk acceptance (*, **, ***),
4.71 false positives, when considering a 1% risk acceptance (**, ***),
0.47 false positives, when considering a 0.1% risk acceptance (***)
</summary>
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Removes the reliance on prototype bound methods internally
so that Uint8Arrays can be set as the bound
thisvalue when callingthe various Buffer methods. Introduces some additional tamper protection
by removing internal reliance on writable properties.
Fixes: #56577