The result of a validator function; a tuple containing whether the input is valid and the transformed input, in that order.
Note that if the input is not valid, then the transformed input will be a bogus value. It might not even be the type you expect.
The type of the output (the transformed input).
The result of a validator function; a tuple containing whether the input is valid and the transformed input, in that order.
Note that if the input is not valid, then the transformed input will be a bogus value. It might not even be the type you expect.