code: function(val, item) {
      if (_.isString(val)) return val.indexOf(item) !== -1;
      if (_.isArray(val))  return _.indexOf(val, item) !== -1;
      if (_.isObject(val)) return _.has(val, item);
      return false;
    }
docs: Check that an item contains another item, either a string, array, or object.