This method is like _.isEqual except that it accepts customizer which is
invoked to compare values. If customizer returns undefined, comparisons
are handled by the method instead. The customizer is invoked with up to
six arguments: (objValue, othValue [, index|key, object, other, stack]).
This method is like _.isEqual except that it accepts customizer which is invoked to compare values. If customizer returns undefined, comparisons are handled by the method instead. The customizer is invoked with up to six arguments: (objValue, othValue [, index|key, object, other, stack]).