cpython/Misc/NEWS.d/next/Library/2025-11-03-17-13-00.gh-issue-140911.7KFvSQ.rst at aed989030739bcd120dc4d9b981d2e856e6d31cb · miss-islington/cpython · GitHub

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:mod:`collections`: Ensure that the methods UserString.rindex() and UserString.index() accept :class:`collections.UserString` instances as the sub argument.