Both max and min characters would be nice!
@Kevin Brown Very much so, good catch, thanks!
This looks like it's already been merged and probably should be marked as complete, yeah?
This would have to be done in fields/types/text/TextType.js in the validateInput function: https://github.com/keystonejs/keystone/blob/22076e6c2be4df15c0693deb30244f013a52c8ae/fields/types/text/TextType.js#L19-L23
There is a bit more information of what the API for this could look like here: https://github.com/keystonejs/keystone/issues/126#issuecomment-33288991
And "min" characters