ArrPrototypeMethods
ArrPrototypeMethods: "length" | "push" | "pop" | "concat" | "join" | "reverse" | "shift" | "slice" | "sort" | "splice" | "unshift" | "indexOf" | "lastIndexOf" | "every" | "some" | "forEach" | "map" | "filter" | "reduce" | "reduceRight" | "find" | "findIndex" | "fill" | "copyWithin" | "entries" | "keys" | "values"
Unions of keys used to access prototype methods on array/tuple types.