Any message incuding slash will be added escape character after calling emit

**_Version 16.1.1_**

I want to emit a message like this:
`["publish",{"channel":"/meeting/5349ee2b-89fe-440b-94cc-d3b752b78e33"}]`
but from Charles the message send out is always like this:
`["publish",{"channel":"\/meeting\/5349ee2b-89fe-440b-94cc-d3b752b78e33"}]`
seems like socket.io will automatically add \ for any content including / 
