code: function deliver(curr, state, name, value) {
    if (curr.state === STATE_PENDING) {
      curr.state = state;
      /*  [Promises/A+ 2.1.2.1, 2.1.3.1]  */
  
      curr[name] = value;
      /*  [Promises/A+ 2.1.2.2, 2.1.3.2]  */
  
      execute(curr);
    }
  
    return curr;
  }
docs: /*  deliver an action