if validation had to run failover() it should let the user know

- node version: v10.19.0
- module version: v17.1
- used in environment: node

the validator should tell me that it had to run the failover() function instead of silently altering the value.

Usecase:
if email validation fails, I don't require it in my database but I need a value in order to save it. It'd also be nice to let the user know that they had an invalid email but currently that isn't possible without an indicator that failover ran.