Exactly. Good control UX should be very liberal in what it accepts and normalize it to whatever form they want. Same goes with editing, it should allow temporar

Exactly. Good control UX should be very liberal in what it accepts and normalize it to whatever form they want. Same goes with editing, it should allow temporary invalidity (extra or fewer digits) turn red/disable submit and then return to green when fixed. Don't make hundreds to millions of users do extra work that could've been automated with a little more care.