Available on js
@:value(cast "closed")@:impl@:enuminlineread onlyCLOSED:DataChannelState = "closed"
@:value(cast "closing")@:impl@:enuminlineread onlyCLOSING:DataChannelState = "closing"
@:value(cast "connecting")@:impl@:enuminlineread onlyCONNECTING:DataChannelState = "connecting"
@:value(cast "open")@:impl@:enuminlineread onlyOPEN:DataChannelState = "open"