code: function minValue(bound, formatError) {
          'use strict';
          return function (value) {
              if (value || !isNaN(parseFloat(value))) {
                  var intValue = Number(value);
                  if (!isNaN(intValue) && intValue < bound) {
                      return formatError(intValue);
                  }
              }
              return '';
          };
      }
docs: Returns a validator that checks if a number is greater than the provided bound
  @param bound The bound
  @param formatError a callback which takes the length and formats an appropriate error message for validation failed