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Remove the caching `_is_case_sensitive()` function. The cache used to speed up `PurePath.[full_]match()` and `Path.[r]glob()`, but that's no longer the case - these methods use `self.parser is posixpath` to determine case sensitivity. This makes the `pathlib._abc` module a little easier to backport to Python 3.8, where `functools.cache()` is unavailable.