Unfortunately, if you subclass AutoNumber from IntEnum it breaks.
---------- Run Python3 ----------Traceback (most recent call last):File "D:\home\repos\mercurial\ref435\ref435.py", line 346, in <module>class Color(AutoNumber):File "D:\home\repos\mercurial\ref435\ref435.py", line 184, in __new__enum_item = __new__(enum_class, *args)TypeError: int() argument must be a string or a number, not 'ellipsis'