protected boolean isEqualValue(Object value1, Object value2) {
        return (value1 == value2);
    }
Compares two values for equals.
This implementation uses <code>==</code>.

@param value1 the first value to compare
@param value2 the second value to compare
@return true if equal by identity
jphp-runtime/src/php/runtime/common/collections/map/IdentityMap.java