Andy Pan

> I see @saghul gave his approval on this a long time ago but I guess that will not suffice to merge this PR. Since @bnoordhuis @vtjnash seemed to have...

Another two weeks have passed, still zero response... Helplessly and despairingly ping @bnoordhuis @vtjnash @saghul @libuv/collaborators

I have to admit that the latest commit has bloated this PR. The original version would be way more concise, maybe we should go back to using a placeholder file...

Hi @vtjnash, do you have a minute to review the latest commit?

这个问题主要是 gnet v1 里出现的，因为 v1 有编码器和解码器的功能，导致解码器在识别第一个特殊包的场景中不是很灵活，但是 gnet v2 移除了编码器和解码器，现在整个数据解析逻辑都要放在 `OnTraffic()` 里了，更加灵活，就没必要再设置一个所谓的 handler 了，用户自己判断一下第一个包然后处理就行了。

不需要每次都判断，你用 `sync.Once` 或者更简单地在 `c.Context` 里设置一个 bool，第一个包解析完之后就设个标志，下次判断一下这个标志，跳过就行了。