Key of non nullable of generic type parameter #31177
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Fixes #23368 ?
This specific issue is already kind of fixed but the underlying problem of
keyof NonNullable<T>not being assignable tokeyof TwhenTis an unconstrained generic parameter is still there (as demonstrated by the test case).It's debatable weather this should be merged as this is a very narrow use case.
The only reason against it is performance. I haven't investigated.