code: function write(cb, item) {
  				if (this.put(item)) {
  						exports.setImmediate(function () {
  							cb(err);
  						});
  					} else {
  						pendingWrites.push([cb, item]);
  					}
  			}
docs: /   `q.write(_, data)`:  queues an item. Waits if the queue is full.