TYP: _NestedSequence type parameter default to work around a mypy issue (#31399)#31404
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jorenham
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May 8, 2026
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Backport of #31399.
PR summary
This works around false positive
var-annotatedmypy errors in certain situations, that's currently blocking a fix for the typeshed stdlib stubs.x-ref: python/typeshed#15472 (comment)
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