So you're basically implementing an "Are you sure?" type system via the validator?
The only way I can think of would be to have the validator store the value in the session, a cookie or a hidden field the first time, then only accept it the second time if it doesn't change.
If you could populate the hidden field the first time, it would make the second time act like a "confirm" field (often used for passwords) where both field must match.


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