I understand  use-cases for 
time_expire=None

but I don't see a use-case for 
time_expire=0



when you do  
cache.redis('message', lambda: 'Hello', time_expire=0)

all the subsequent *cache.redis('message',....)* will overwrite Hello

to get a persistent Hello you have to write something like:

cache.redis('message', None)
cache.redis('message',lambda: 'Hello', time_expire=None)

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