Unsafe subtype: datetime/date#20448

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m-aciek wants to merge 11 commits intopython:masterfrom

m-aciek:unsafe-subtype

Commits on Dec 19, 2025

Initial plan
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Implement unsafe subtype checking for datetime/date comparisons

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m-aciek
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Fix docstring indentation and line continuation style

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m-aciek
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Flag date vs date comparisons as unsafe when datetime subclass exists

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m-aciek
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Add detailed documentation for supertype comparison checking

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m-aciek
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Block datetime/date inheritance when unsafe-subtype is enabled

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m-aciek
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Move errorcodes import to module level for performance

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m-aciek
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