Checks if all values in the range fit in an int.

This checks that all valid values are within the bounds of an int.

For example, the ISO month-of-year has values from 1 to 12, which fits in an int. By comparison, ISO nano-of-day runs from 1 to 86,400,000,000,000 which does not fit in an int.

This implementation uses getMinimum() and getMaximum().

Returns:  true if a valid value always fits in an int