Jim Jewett <jimjjew...@gmail.com> added the comment:

Going back to Raymond's analysis, this is useful when at least some of the 
parameters either do not change the result, or are not hashable.

At a minimum, you need to figure out which parameters those are, and whether to 
drop them or transform them.

Is this already sufficiently rare or tricky that a subclass is justified, 
instead of trying to shoehorn things into a single key method?

----------
nosy: +Jim.Jewett

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