Change Details

`typing.Literal` is new in Python 3.8. We still support Python 3.6 and 3.7.

`typing.Literal` is new in Python 3.8. We still support Python 3.6 and 3.7. See D13659#304051

`typing.Literal` is new in Python 3.8. We still support Python 3.6 and 3.7. See D13659#304051