Parameterize SupportsItems to handle Mapping key invariance#7426
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sigmavirus24
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May 11, 2026
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This PR parameterizes our
SupportsItemsclass similar to what's done in Typeshed. This avoids issues with our currentMapping[..., ...]typing for params described in #7271 (comment). It also better maps to how we're representing our Iterable definitions on the same parameters.