The are pretty darn slick. There's an integer one and a floating point
one. They support automatic range limiting (ex., you can't even type a
number outside of the range), proper number formats (ex., you can't
enter a decimal point in an integer field), you can't enter bogus
numbers like "0.3-.2", thousands separators are supported, decimal
precision may be specified and proper number formatting for string
values (or automatic conversion to int, double, float, etc.).
08c94d5372