docs: def is_complex(arg):
      '''
      is_complex(x) yields True if x is a complex numeric object and False otherwise. Note that this
        includes anything representable as as a complex number such as an integer or a boolean value.
        In effect, this makes this function an alias for is_number(arg).
      '''
      return (is_complex(mag(arg)) if is_quantity(arg)                 else
              True                 if isinstance(arg, numbers.Complex) else
              is_npscalar(arg, 'complex') or is_npvalue(arg, 'complex'))