Implement TypedDict extra_items= (PEP 728)#21712

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boogerlad:pep728-extra-items

Commits on Jul 9, 2026

PEP 728 phase 1: store closed TypedDicts as extra_items=Never
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PEP 728 phase 2: support defining TypedDicts with extra_items=
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Rename TypedDictType.extra_items_from and support extra_items in stubgen
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Allow open TypedDicts to drop top-typed read-only non-required keys
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PEP 728 phase 3: support using TypedDicts with extra_items=
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PEP 728 phase 4: precise mapping views for TypedDicts with extra_items=
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Add tests for recursive extra_items and Unpack protocol equivalence
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Check the extra_items pseudo-item when ** unpacking a TypedDict at call sites
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Reject invalid ReadOnly redeclarations in TypedDict inheritance
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Share the PEP 728 value-union computation and infer through pseudo-items
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Keep repeated extra_items kwarg case out of the parallel test suite
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