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Changgelog: ============= - Require Python 3.9 or later - Remove MRUCache and the @func.mru_cache decorator - Add an optional condition parameter to the @cached and @cachedmethod decorators, which, when used with a threading.Condition instance, should improve cache stampede issues in massively parallel environments. - Convert the cachetools.func decorators to use a threading.Condition instance to deal with cache stampede issues. Note that this may result in a noticable performance degradation, depending on your actual use case. - Deprecate support for cache(self) returning None to suppress caching with the @cachedmethod decorator. - Improve documentation. - Update CI environment. Signed-off-by: Wang Mingyu <wangmy@fujitsu.com> Signed-off-by: Khem Raj <raj.khem@gmail.com>