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I can't imagine why are you using Y.cached, it serves no purpose on functions that don't accept arguments. If a function takes no arguments or if the function being cached my change the value returned based on other factors but the arguments themselves, Y.cached serves no purpose.

In this case, you are just as well calculating the value and storing it. Your cached function gets executed just once, when the module is initially loaded so it won't be recalculated. Y.cached might be confused by the lack of arguments to use as a key to fetch the calculated value.

Anyway, since you don't really need Y.cached, it doesn't matter why it fails.