RTCDataChannel not properly closed

[Marcel-G]

Problem

When RTCDataChannel: close() method on a JS client (Chrome for example) the data channel hangs in closing state and never transitions to closed.
This causes a memory leak and eventually more data channels cannot be created with the following error:

Uncaught (in promise) DOMException: Failed to execute 'createDataChannel' on 'RTCPeerConnection': RTCDataChannel creation failed

Reproduction

Using the examples/data-channels
Run the JS test for closing data channels: jsfiddle
Note the RTCDataChannel never enters closed state.

Possible cause

I suspect the issue here is with webrtc-rs not replying with a stream reset to the browsers request to close the stream. I see the spec referenced here but am not sure if it's working correctly.

[Marcel-G]

Possibly relevant info in pion/sctp#238