You can type non-numeric or invalid characters into the numeric fields (copies, page range, scale). These will always cause the field to be invalid so we should prevent it instead.

In the case of Scale, entering a decimal (e.g. 33.333%) might seem reasonable enough, although if I try, it complains "Scale must be a number between 10 and 200."

Floating point conversion unfortunately makes entering decimal values into the scale field unwieldy. If we allow decimals then entering 14 would result in 14.000000000000002 being entered into the field on the next print load.

Looks like bug 1660060 was already on file for the non-numeric stuff.