Hi,

Let's say you have a list as follows:

['1', '2', '3']

It will parse it as it is if you are using the built-in pydantic list

simple_list: list = None

On the other hand, typing.List allows you to set sub-type constraint.

['1', '2', '3']

Can be parsed as [1, 2, 3] if you specify it as

simple_list: List[int] = None

each string elements inside it will be casted to integer instead.