Sync typeshed#16721
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Source commit: python/typeshed@1d3c326
This is allegedly causing large performance problems, see 13821 typeshed/8231 had zero hits on mypy_primer, so it's not the worst thing to undo. Patching this in typeshed also feels weird, since there's a more general soundness issue. If a typevar has a bound or constraint, we might not want to solve it to a Literal. If we can confirm the performance regression or fix the unsoundness within mypy, I might pursue upstreaming this in typeshed. (Reminder: add this to the sync_typeshed script once merged)
Since the plugin provides superior type checking: #13987 (comment) A manual cherry-pick of e437cdf.
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Diff from mypy_primer, showing the effect of this PR on open source code: spack (https://github.com/spack/spack)
+ lib/spack/spack/oci/oci.py:142: error: Argument 1 to "endpoint" of "ImageReference" has incompatible type "Optional[str]"; expected "str" [arg-type]
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Sync typeshed
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python/typeshed@1d3c326
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