Absolutely. How the hell is `green = None` explicit?!

On the other hand, `class Color(Enum, style='declarative'):` is explicit. People must learn something. Why then don't they learn the right thing instead of "hey, assigning None inside enums magically does the right thing" - except when it doesn't.

Just a hint of a nightmare scenario: you write a method decorator, but you forget to return a value from it (happened to me more times than I care to admit). Ooops, your method is now next member of your enum. Good luck debugging that. :-O

In fact, what _is_ explicit, is this:

    class Color(metaclass=Enum):
        green = object()
        yellow = object()

I could live with it. :-)