I realized today that caching breaks one of Lisp's cardinal rules (as quoted from OnLisp): The convention in Lisp seems to be that an invocation owns objects i

I realized today that caching breaks one of Lisp's cardinal rules (as quoted from OnLisp): The convention in Lisp seems to be that an invocation owns objects it receives as return values, but not objects passed to it as arguments. How do experienced Lispers deal with this? Just being careful?