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Title: Fix matching against union of tuples by saulshanabrook · Pull Request #19600 · python/mypy · GitHub

Open Graph Title: Fix matching against union of tuples by saulshanabrook · Pull Request #19600 · python/mypy

X Title: Fix matching against union of tuples by saulshanabrook · Pull Request #19600 · python/mypy

Description: Optional static typing for Python. Contribute to python/mypy development by creating an account on GitHub.

Open Graph Description: This pull request fixes handling of union types containing tuples in match statements. Previously, when a tuple was part of a union, all its items would be unioned together and treated as a homogen...

X Description: This pull request fixes handling of union types containing tuples in match statements. Previously, when a tuple was part of a union, all its items would be unioned together and treated as a homogen...

Opengraph URL: https://github.com/python/mypy/pull/19600

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Further improve match statement narrowing against unions (https://github.com/python/mypy/commit/9752e1968e9224d2ead4f0cdfd5ff3791ab21b35
#20744https://github.com/python/mypy/pull/20744
)https://github.com/python/mypy/commit/9752e1968e9224d2ead4f0cdfd5ff3791ab21b35
9752e19https://github.com/python/mypy/commit/9752e1968e9224d2ead4f0cdfd5ff3791ab21b35
#19600https://github.com/python/mypy/pull/19600
#19600https://github.com/python/mypy/pull/19600
#15190https://github.com/python/mypy/issues/15190
#17549https://github.com/python/mypy/issues/17549
#17600https://github.com/python/mypy/pull/17600
#18039https://github.com/python/mypy/issues/18039
#19081https://github.com/python/mypy/issues/19081
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https://github.com/python/mypy/pull/19600/files/5a6464afb8a3ae59d753969251a34f7f39fee6af
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https://github.com/python/mypy/pull/19600/files/0d9e2feaf6abc8b95a2dacb9d1b018e82431a55b
upnext https://github.com/python/mypy/issues?q=state%3Aopen%20label%3Aupnext
Matching tuple against union merges field types https://github.com/python/mypy/issues/19599
Type narrowing for a tuple is worse with match than with the equivalent isinstance check https://github.com/python/mypy/issues/19082
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