Post by Sylvia Else
Put in a phone number with spaces, press enter, and hover over the
field, and you get the error message "Non-negative whole number (required)".
Hopefully only those with computer science backgrounds will have tax
queries, because I can't imagine what the man in the street would make
of such an error message.
For those /with/ a computer science background it also does
not make sense since what is required really is a /numeral/
and not a /number/.
The form of a numeral depends on the language to be used,
a language might have numerals with spaces.
The formally correct way to proceed would be to explain the
language to be used and only then require to use it.
A so-called phone "number", however, is not really a number
at all, but a digit sequence that sometimes might also
contain other symbols. Also because of this, it is not
appropriate to ask for a "[n]on-negative whole number".