Unsafe subtype: datetime/date#20448

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m-aciek wants to merge 17 commits intopython:masterfrom

m-aciek:unsafe-subtype

Commits on Dec 19, 2025

Initial plan
Copilot
committed
Implement unsafe subtype checking for datetime/date comparisons

Copilot
and
m-aciek
committed
Fix docstring indentation and line continuation style

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

Copilot
and
m-aciek
committed
Add detailed documentation for supertype comparison checking

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

Copilot
and
m-aciek
committed
Move errorcodes import to module level for performance

Copilot
and
m-aciek
committed

Commits on Dec 26, 2025

Remove superfluous iteration

m-aciek
and
sterliakov
authored

Commits on Jan 21, 2026

Commits on Feb 4, 2026