@@can.deleteKeyValue( key )

The can.deleteKeyValue symbol points to a Map-like object's property removal function, which removes the object's property with the supplied key. This is only applicable to objects where keyed properties are relevant (like maps).

var map = {
    removeKey: function (key) {
        delete this[key];
    }
}

map[canSymbol.for('can.deleteKeyValue')] = map.removeKey;