Compares records own key by own key with the provided element equality;
inherited enumerable properties are ignored on both sides.
A key present on one side only is equal only if its value is undefined
(mirroring how a missing key reads as undefined); the element equality is
never invoked with a missing key's undefined.
Compares records own key by own key with the provided element equality; inherited enumerable properties are ignored on both sides. A key present on one side only is equal only if its value is
undefined(mirroring how a missing key reads asundefined); the element equality is never invoked with a missing key'sundefined.