I want it to be the case that this function only actually calls do-something-very-expensive once per unique value of x, even across separate invocations of dumb-example.
My code memoizes results of function FIB _inside_ the lambda assigned to EXAMPLE, even across separate invocations of EXAMPLE.
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My code memoizes results of function FIB _inside_ the lambda assigned to EXAMPLE, even across separate invocations of EXAMPLE.