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Cross-linking python/peps#3649.

@JelleZijlstra
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I picked the name TypeNarrower, but it's very possible that we'll eventually end up with a different name. That could raise problems for backwards compatibility in typing-extensions, but I think it's fine: we'd simply rename TypeNarrower to the new name, and keep around TypeNarrower as an alias indefinitely.

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Good name.

@JelleZijlstra JelleZijlstra changed the title Add support for TypeNarrower (PEP 742) Add support for TypeIs (PEP 742) Feb 14, 2024
@JelleZijlstra JelleZijlstra merged commit 566e01e into python:main Feb 16, 2024
@JelleZijlstra JelleZijlstra deleted the typenarrower branch February 16, 2024 04:21
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