Hi,

I'm writing to you today to suggest that you consider unifying the error types for each struct in the nutype package. Currently, each struct has its own enum error type, which can make it difficult to track and handle errors.

I propose that we unify the error types into a single error type called ValidateError. This would make it easier to track and handle errors, as we would only need to handle a single error type instead of multiple error types.

I believe that this change would be a valuable improvement to the nutype package. Thank you for your time and consideration.