docs: def is_proxy(elt):
      """Return True if elt is a proxy.
  
      :param elt: elt to check such as a proxy.
      :return: True iif elt is a proxy.
      :rtype: bool
      """
  
      if ismethod(elt):
          elt = get_method_function(elt)
  
      result = hasattr(elt, __PROXIFIED__)
  
      return result