We’ve had Map with those semantics since 2014, came out in Chrome a few months before Set.
Record/Tuple objects are immutable primitives with structural equality, not object reference equality. So little relation to AS3 Dictionary/ES6 Map, besides being possible keys for Map/Set.
Record/Tuple objects are immutable primitives with structural equality, not object reference equality. So little relation to AS3 Dictionary/ES6 Map, besides being possible keys for Map/Set.