Commits on Jan 10, 2022

1. Make enum values final - fixes python#11919 …

   This fix allows using enum values in place of literals.
   
   For example:
   
   ```
   def is_a(a: Literal["a"]): return None
   class MyStr(Enum):
       a = "a"
       b = "b"
   
   is_a(MyStr.a.value)
   ```
   
   Currently this fails with
   
   ```
   error: Argument 1 to "is_a" has incompatible type "str"; expected "Literal['a']"
   ```
   
   The fix itself is simple - the special casing of  final status for enums was being
   called too late to have an effect. Moving the function call up solves
   the problem.

   

   joey-laminar committed Jan 10, 2022
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