[Enum] attributes of mixed-in classes can be shadowed by other members

[ethanfurman]

As mentioned in #101273 , when mixing data types into an enum, the data type's methods can be lost:

from enum import StrEnum, auto

class Book(StrEnum):
    author = auto()
    title = auto()
    isbn = auto()

Book.author
# <Book.author: 'author'>

Book.author.title()
# book object not callable exception, but 'Author' is expected

Linked PRs

• gh-103596: [Enum] do not shadow mixed-in methods/attributes #103600

[ethanfurman]

This is a long-standing issue, so not going to backport any fix.