Fix TypedDict qualifier inheritance with same name #677
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Discovered through CPython 3.14 test_typing.py: https://github.com/JanEricNitschke/typing_extensions/actions/runs/17619859892/job/50062609198#step:7:44
Tests and code are directly taken from CPython 3.14.
Tests: https://github.com/python/cpython/blob/3.14/Lib/test/test_typing.py#L8616
Code: https://github.com/python/cpython/blob/3.14/Lib/typing.py#L3139
Except that i omitted the raising of the
TypeError
when overwriting a mutable key with a read-only key pending further discussion.