I have a function which takes two inputs which I would like to memoize. The output of the function only depends on the value of the first input, the value of the second input has no functional effect on the outcome (but it may affect how long it takes to finish). Since I don't want the second parameter to affect the memoization I cannot use memoize. Is there an idiomatic way to do this or will I just have to implement the memoization myself?