code: function startDispatching(action) {
  	require('./debug.es6').logDispatch(action);
  
  	Object.keys(this[CALLBACKS]).forEach((id) => {
  		this[IS_PENDING][id] = false;
  		this[IS_HANDLED][id] = false;
  	});
  
  	this[PENDING_ACTION] = action;
  	this[IS_DISPATCHING] = true;
  }
docs: Set up bookkeeping needed when dispatching.
  
  @param {object} action
  @internal