No more manual discovery of validators, automated registration and lookup process, cleaned lots of code on this one!
New Validator: Accepted - The field under validation must be yes, on, 1, or true. This is useful for validating "Terms of Service" acceptance.
New Validator: Alpha - Only allows alphabetic characters
New Validator: RequiredUnless with validation data as a struct literal { anotherField:value, ... } - The field under validation must be present and not empty unless the anotherfield field is equal to the passed value.
New Validator: RequiredIf with validation data as a struct literal { anotherField:value, ... } - The field under validation must be present and not empty if the anotherfield field is equal to the passed value.
Accelerated validation by removing type checks. ACF chokes on interface checks
Consistency on all validators to ignore null or empty values except the Required validator
Formatting consistencies
Improve error messages to describe better validation
Get away from evaluate() instead use invoke()
Bugs : Fixed lots of wrong type exceptions
Compat : Remove ACF11 support