Perhaps a section in the docs about the differences from typical Python classes is warranted:

  - Enum members are virtual
  - Enum members are singletons
  - new Enum members (aka instances of an Enum class) cannot be created
  - during class creation Enum members cannot be overwritten, nor overwrite
    other class attributes
  - Enum classes with members cannot be subclassed
  - Enum classes support iteration
  - Enum classes support containment