Weird `enum.Enum` signature?

[ego-thales]

Hello,

I'm wondering the following regarding Enum.__signature__:

1. Why return a str (better suited for __text_signature__ isn't it?)
2. When there are members, why choose '(*values)' over the more accurate (I think) '(value)'?

cpython/Lib/enum.py

Lines 1148 to 1150 in f218549

	def __signature__(cls):
	if cls._member_names_:
	return '(*values)'

If acted upon, I think it would be better to replace current signatures with Signature types. For example for enums with members:

__signature__ = Signature([Parameter("value", Parameter.POSITIONAL_OR_KEYWORD)])

All the best!