[issue25447] TypeError invoking deepcopy on lru_cache

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I'm not sure that we can say that deepcopying was not supported for lru_cache. copy.deepcopy() returned the same object, as for immutable objects, but can we consider decorated with lru_cache() function immutable?
 
The question is: if made functools._lru_cache_wrapper to support deepcopy protocol, should the result of copy.deepcopy() share the cache with original?

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nosy: +serhiy.storchaka

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