Comment by djoldman
I don't understand how this helps.
Defining a subset of unicode to accept does not obviate the need to check that values conform to type definitions.
I don't understand how this helps.
Defining a subset of unicode to accept does not obviate the need to check that values conform to type definitions.
Yes, that's true. It's for generic, low-level parsing code that doesn't know what a username is. There will also need to be field-specific validation.