Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> But if you need lru_cache() why not use lru_cache() 
> from the stdlib?

This gives a foundation for people who want to roll their own variants of the 
standard library lru_cache().  From here, people can experiment with pickle 
support, dynamic resizing, invalidation methods, max age parameters, other ways 
to construct a key, tests for total available memory, direct access to cache 
entries, or any of the other feature requests we've declined because they 
weren't appropriate for the standard library.

Also, it nicely shows-off the original motivating use case for move_to_end().

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<https://bugs.python.org/issue44782>
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