When `x` is an `Enum`, duper `get_reduce` raises an error

[mikelane]

The problem is here. Since an Enum doesn't have an instance of self, when __reduce_ex__(4) is called, you will get an error telling you that you are missing one required positional argument. In order to call __reduce_ex__(4) on an Enum, you'd have to use one of the concrete enum values. For example:

>>> from enum import Enum
>>> class Test(Enum):
  2     FOO = 1
>>> Test.__reduce_ex__(4)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: __reduce_ex__() missing 1 required positional argument: 'proto'

__reduce_ex__() missing 1 required positional argument: 'proto'
>>> Test.FOO.__reduce_ex__(4)
(<enum 'Test'>, (1,))
>>>

I'm still digging into the code to fully understand what's going on here, so I'm don't have enough context to give a good recommendation. It is perhaps the case that you'd have to iterate over each of the enum values to call __reduce_ex__(4) on them one-by-one. Or perhaps it is the case that Enums are not able to be used by this method.

[Bobronium]

Hi, thanks for report and in-depth description!

Sorry for a long answer, took a pause from GitHub :)

I see the issue you're describing, but can't come up with a use case that would reproduce it.

Please, provide end-to-end example of how you're using duper and the stack trace you're getting.

PR is also welcomed, once issue is confirmed!

[th3w1zard1]

Took a quick look at this issue, this one may be a bit challenging especially due to the enum changes over the last few Python minor versions. Enum class does a couple of gnarly things under the hood to get it working.

In most scenarios, I can't imagine why you'd need a duplicate Enum class? Isn't the whole point to represent static data?