equals method

@override bool equals(Object? obj1, Object? obj2)

Compare two elements for being equal.

This should be a proper equality relation.

Implementation

@override
bool equals(Object? obj1, Object? obj2) => //
    (obj1 is MapEntry && obj2 is MapEntry) //
        ? obj1.key == obj2.key && obj1.value == obj2.value
        : obj1 == obj2;