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re: caching python functions, is it referring to functools.lru_cache maybe?

Almost certainly. It's just called `functools.cache` now. It's also known as memoisation and a classic use of higher-level functions (aka decorators).

And memoisation is a common technique to shift performance (processing -> memory) tradeoffs when doing anything trivially recursive.

I don't agree with TFA's take of "Nor does it make any sense to have caching at the function level?"

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