Just adding a @lru_cache() to a python isn't guaranteed to be correct; for example, if you're reading from an API the response could change between calls. Skip

Just adding a @lru_cache() to a python isn't guaranteed to be correct; for example, if you're reading from an API the response could change between calls. Skip tracks side effects, and will either (a) memoize automatically a pure function or (b) recognize that a function is impure and avoid the memoization.