[ty] Refactor handling of special forms#23513

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AlexWaygood wants to merge 9 commits intomainfrom

claude/merge-fix-compile-errors-BPawF

Commits on Nov 8, 2025

[ty] Add diagnostics for `isinstance()` and `issubclass()` calls that use invalid PEP-604 unions for their second argument
AlexWaygood
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Commits on Feb 22, 2026

Commits on Feb 23, 2026