code: function _toArray(item) {
    if (Array.isArray(item)) {
      return item;
    }
  
    if (typeof item === 'undefined' || item === null) {
      return [];
    }
  
    return [item];
  }
docs: Converts non-arrays to arrays.  Leaves arrays alone.  Converts
  undefined values to empty arrays ([] instead of [undefined]).
  Otherwise, just returns [item] for non-array items.
  
  @param {*} item
  @returns {array} boom! much array. very indexed. so useful.