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Mike Bayer 48410f8340 typing updates to accept with_polymorphic(), aliases
Fixed typing issues where ORM mapped classes and aliased entities could not
be used as keys in result row mappings or as join targets in select
statements. Patterns such as ``row._mapping[User]``,
``row._mapping[aliased(User)]``, ``row._mapping[with_polymorphic(...)]``
(rejected by both mypy and Pylance), and ``.join(aliased(User))``
(rejected by Pylance) are documented and fully supported at runtime but
were previously rejected by type checkers. The type definitions for
:class:`._KeyType` and :class:`._FromClauseArgument` have been updated to
accept these ORM entity types.

Fixes: #13075
Change-Id: Icc3b1ef832b01fd205b1409b2f6d0f211395d4ad
2026-01-13 11:26:06 -05:00
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