The module provides a fast implementation of cached properties for
Python 3.8+.

The API is designed to be nearly identical to the built-in
``functools.cached_property`` class, except for the additional
``under_cached_property`` class which uses ``self._cache`` instead
of ``self.__dict__`` to store the cached values and prevents
``__set__`` from being called.

Homepage:
https://github.com/aio-libs/propcache
