dogpile.cache.memory is curiously destructive of its inputs

[0xDEC0DE]

Steps to reproduce

from dogpile.cache import make_region

dpc_args = dict(cache_dict=dict(cache='warm'))
print(f"Before: {dpc_args}")
make_region().configure('dogpile.cache.memory', arguments=dpc_args)
print(f"After: {dpc_args}")

Expected result

Before and After output is identical.

Actual behavior

The arguments to the configure method get eaten:

Before: {'cache_dict': {'cache': 'warm'}}
After: {}

Miscellany

Only the MemoryBackend and its derived classes seem to do this.

[0xDEC0DE]

This looks like it will get addressed by #270 or #275, whichever one lands.

[sqla-tester]

Nicolas Simonds has proposed a fix for this issue in the main branch:

fix: make dogpile.cache.memory preserve its init parameters https://gerrit.sqlalchemy.org/c/sqlalchemy/dogpile.cache/+/6084