Performance improvements #35
Open
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This is a rewrite to address the performance issues with the library. Originally, the library would read single characters from the file and create a lot of temporary strings. This rewrite reads the file in chunks of up to 16KiB depending on the file size, pushes the data into an array while counting new lines, then finally reverses the array. It's possible that further performance improvements could be gained for large line counts depending on how arrays are handled internally in Node when pushing / reversing, but I haven't looked into that so far.
This should help with #26