digits validation doesn't work for input='number' in FF

[rafalskyi]

in FF in input='number' angular validation fired first when enter letters and i am getting empty message.
temp solution

angular.module(app_name).factory('numberOnlyValidator',  function () {
  return {
    name: 'numberOnly', // this is the validator name that can be referenced from the constraints JSON
    validate: function (value) {
      // value: the value to validate
      // arguments: the validator arguments
      return /^[1-9]\d*(\.\d+)?$/.test(value);
    }
  };
});