Python 3.15 tracking issue

[hauntsaninja]

• PEP 810 lazy import. Support for lazy imports (PEP 810, Python 3.15+) #20978 needs native parser support + tests
• PEP 814 frozendict. should only need typeshed sync
• PEP 661 sentinel. will need custom narrowing and typeanal
• PEP 798 comprehension unpacking
• PEP 728 typeddict Add support for TypedDict extra_items= and closed= (PEP 728) #18176
• PEP 747 typeform TypeForm[T]: Spelling for regular types (int, str) & special forms (Union[int, str], Literal['foo'], etc) #9773 needs perf regression fixed, see TypeForm: Enable by default #21262 (comment)