Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, to please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

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You should be also able delete these baseline exclusions: https://github.com/dotnet/runtime/blob/main/src/libraries/System.Runtime/src/MatchingRefApiCompatBaseline.txt#L28