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* `array.find(arr, elem)` -- scan table `arr` for `elem` assuming it's organized as an array (just numeric indices).
* `array.find(arr, elem)` -- scan table `arr` for `elem` assuming it's
organized as an array (just numeric indices).
* `array.any(arr, f)` -- scan table `arr` for any elements satisfying predicate `f`. Return first such element or `false` if none.
* `array.any(arr, f)` -- scan table `arr` for any elements satisfying
predicate `f`. Return first such element or `false` if none.