[webrtc-pc] RTCDataChannel.send(null)

lgrahl has just created a new issue for https://github.com/w3c/webrtc-pc:

== RTCDataChannel.send(null) ==
I'm unsure what's supposed to happen when calling `dataChannel.send(null)`. Step 3 of the `send` method states:

> Execute the sub step that corresponds to the type of the methods argument:
> ...

But what if none of the types match?

Please view or discuss this issue at https://github.com/w3c/webrtc-pc/issues/1835 using your GitHub account