Error with `TypeVarTuple` typing

[St4rG00se]

Hello!

I'm using mutmut for my mutation tests but I get this KeyError error with python 3.11 TypeVarTuple typing syntax :

Example of code:

T = TypeVar('T') 
Ts = TypeVarTuple('Ts') 

def append(tpl: tuple[*Ts], value: T) -> tuple[*Ts, T]:
    return tpl + (value,)

result :

KeyError: ReservedString(*)

This it because of the * in the function signature

Thx ;)