code: function _newGraphSONMapper() {
          return Tinkerpop.GraphSONMapper.buildP()
              .then(function (builder) {
              return builder.embedTypesP(true);
          })
              .then(function (builder) {
              return builder.createP();
          });
      }
docs: ### `_newGraphSONMapper()` Create a GraphSONMapper (promise) that preserves types.