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Narrow Any in and_conditional_map#21167

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hauntsaninja wants to merge 1 commit intopython:masterfrom
hauntsaninja:narrowcondit
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Narrow Any in and_conditional_map#21167
hauntsaninja wants to merge 1 commit intopython:masterfrom
hauntsaninja:narrowcondit

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@hauntsaninja hauntsaninja commented Apr 4, 2026

Prior to this, mypy's behaviour is inconsistent depending on the order of the condition or the presence of terms in the condition other than isinstance

Fixes #17100 , fixes #20363 , fixes #16462

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tanjun is good, first homeassistant is good, second homeassistant is meh, ddtrace is good

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github-actions bot commented Apr 4, 2026

Diff from mypy_primer, showing the effect of this PR on open source code:

core (https://github.com/home-assistant/core)
+ homeassistant/config.py:1045: error: Argument 1 to "add" of "set" has incompatible type "Hashable"; expected "str"  [arg-type]
+ homeassistant/components/schedule/__init__.py:393: error: Need type annotation for "data_keys" (hint: "data_keys: set[<type>] = ...")  [var-annotated]

Tanjun (https://github.com/FasterSpeeding/Tanjun)
+ tanjun/clients.py:3154: error: Redundant cast to "Iterable[Any]"  [redundant-cast]

dd-trace-py (https://github.com/DataDog/dd-trace-py)
+ ddtrace/appsec/_iast/taint_sinks/ssrf.py:69: error: Argument 1 to "find" of "bytes" has incompatible type "str"; expected "Buffer | SupportsIndex"  [arg-type]
+ ddtrace/appsec/_iast/taint_sinks/ssrf.py:69: error: Argument 1 to "find" of "bytearray" has incompatible type "str"; expected "Buffer | SupportsIndex"  [arg-type]

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