           6: this._delProp,
           7: this._typeOf,
           8: repl});
-        repl._espressoExceptionObjects = {};
         repl._espressoLastID = 8;
         repl._espressoGC = this._espressoGC;
-        repl._espressoReplID = 'espresso_' + (Date.now() + Math.random());
       }
     },
 
     _espressoGC: function _espressoGC(ids_in_use) {
       var objects = this._espressoObjects;
-      var exobjects = this._espressoExceptionObjects;
       var keys = [];
       var num_freed = 0;
 

    },

    _findOrAllocateObject: function _findOrAllocateObject(repl, value) {
      if(value.constructor === Object) {
        for(var id in repl._espressoExceptionObjects) {
          id = Number(id);
          var obj = repl._espressoExceptionObjects[id];
          if(obj === value) {
            return id;
          }
        }

        var id = ++repl._espressoLastID;
        repl._espressoObjects[id] = repl._espressoExceptionObjects[id] = value;
        return id;
      }

      var repl_id = repl._espressoReplID;
      if(value[repl_id] !== undefined) {
        return value[repl_id];
      }

      var id = value[repl_id] = ++repl._espressoLastID;
      repl._espressoObjects[id] = value;
      return id;
    },

        var id = ids_in_use[i++];
        while(j < keys.length && keys[j] !== id) {
          var k_id = keys[j++];
          delete objects[k_id];
          ++num_freed;
        }
        ++j;
