I think the argument that something like a phone “number” or Social Security Number is not actually a number is absolutely valid. If they were numbers, then ad

I think the argument that something like a phone “number” or Social Security Number is not actually a number is absolutely valid. If they were numbers, then adding 2 SSNs would have some valid meaning. In reality, adding 2 SSNs is an entirely useless operation. What they are is basically identifiers who happen to restrict the set of allowable characters to digits. One consequence of using input type number on a 2 factor verification code box that I have seen is that the browser would eliminate the leading 0. Which is absolutely the correct behavior if the code was indeed a number, but leads to incorrect behavior since it’s not.