The hash cannot be computed, because it's not really a hash at all. In JavaScript's Map and Set, Objects are considered equivalent if they are the same object i

The hash cannot be computed, because it's not really a hash at all. In JavaScript's Map and Set, Objects are considered equivalent if they are the same object instance, not if their contents are the same. So really the "hash" is a unique tag. I believe the object's memory location can not be used, as the object may be relocated, and/or a different object stored at the same location at a later time.