Turn off memoization for the specified function
(unmemoize 'foo) ; turn off memoization of foo
where fn evaluates to a function symbol that is currently memoized;
see memoize. An exception is that as with memoize, fn may
evaluate to the name of a macro that is associated with such a function
symbol; see macro-aliases-table.
Calls of this macro generate events of the form (table memoize-table fn
nil). When successful, the returned value is of the form (mv nil
To remove the effects of all memoize events, evaluate:
(clear-memo-table). To save and restore memoization, see save-and-clear-memoization-settings and see restore-memoization-settings.