docs: function serializeIntoEqualString(obj) {
  
          var out = '';
  
          _.forEach(obj, function(val, key) {
              var stringVal;
  
              try {
                  stringVal = JSON.stringify(val, safeCycles());
              } catch (e) {
                  if (safeJsonStringify) {
                      stringVal = safeJsonStringify(val);
                  } else {
                      stringVal = 'unserializable! you can install ' +
                                  '"safe-json"stringify" module for safer ' +
                                  'stringification';
                  }
              }
  
              out += key + '=' + stringVal + ', ';
          });
          // remove last comma
          return out.slice(0, -2);
      }