The number widget uses an HTML number input, saving the value as a string, integer, or floating point number.
numbervalue_type optiondefault: accepts string or number value; defaults to empty stringvalue_type: accepts int or float; any other value results in saving as a stringmin: accepts a number for minimum value accepted; unset by defaultmax: accepts a number for maximum value accepted; unset by defaultstep: accepts a number for stepping up/down values in the input; 1 by default