The connection is very obvious after you know about it.
And probably you can guess the meaning if you see an
@once decorator in someone's code. But it's less clear
that a person who hasn't seen the word "once" used
this way will think of searching for it when they want
a way to cache the return value of a function.
https://docs.python.org/3/library/functools.html#functools.lru_cache
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