docs: function canInputMoreNumbers() {
                      var haventReachedMaxLength = !($input.val().length >= $input.attr("maxlength") && $input.attr("maxlength") >= 0),
                          selection = getInputSelection(),
                          start = selection.start,
                          end = selection.end,
                          haveNumberSelected = (selection.start !== selection.end && $input.val().substring(start, end).match(/\d/)) ? true : false,
                          startWithZero = ($input.val().substring(0, 1) === "0");
                      return haventReachedMaxLength || haveNumberSelected || startWithZero;
                  }