id value = _myNumberValue;

        if ( [value isKindOfClass:[NSNumber class]]  )
        {
        // We have to check what is NSNumber really pointing to
            if ( value == (void*)kCFBooleanFalse || value == (void*)kCFBooleanTrue)
            {
                // The value is a BOOL
            }
            else if (  ! CFNumberIsFloatType((CFNumberRef)value))
            {
               // The value is an int
            }
            else
            {
                // The value is a float or double
            }
        }