docs: function EventHistory(node) {
  
          this.node = node;
  
          /**
           * ### EventHistory.history
           *
           * Database of emitted events
           *
           * @see NDDB
           * @see EventEmitter.store
           *
           */
          this.history = new NDDB();
  
          this.history.hash('stage', function(e) {
              var stage;
              if (!e) return;
              stage = 'object' === typeof e.stage ?
                  e.stage : this.node.game.stage;
              return node.GameStage.toHash(stage, 'S.s.r');
          });
  
      }