code: function unmarshalPassThrough(item) {
    var key = _.find(function(type) {
      return _.has(type, item);
    }, ['S', 'B', 'BS', 'BOOL']);
  
    return !key ? void 0 : item[key];
  }
docs: Converts DynamoDb "S", "B", "BS", "BOOL" to values.
  
  @param item
  @returns {*}