Modify OfType to accept nullable input element type #2260
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This enables e.g. ```cs IObservable<string?> s = ...; IObservable<string> s.OfType<string>() ``` to filter it down to just the non-null strings. This is consistent with how System.Linq.Async was changed (and how the .NET runtime library replacement for this, System.Linq.AsyncEnumerable` also works).
This was referenced Oct 22, 2025
mwadams
approved these changes
Oct 22, 2025
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Resolves #2247
This enables e.g.
to filter it down to just the non-null strings.
This is consistent with how System.Linq.Async was changed (and how the .NET runtime library replacement for this, System.Linq.AsyncEnumerable` also works).