BroadcastChannel:

• is listed in the stable docs

• is not listed in the unstable docs

• throws a ReferenceError without using --unstable:

  $ deno repl
  Deno 1.17.1
  exit using ctrl+d or close()
  > new BroadcastChannel()
  Uncaught ReferenceError: BroadcastChannel is not defined
      at <anonymous>:2:1
  > close()
  
  $ deno repl --unstable
  Deno 1.17.1
  exit using ctrl+d or close()
  > new BroadcastChannel()
  Uncaught TypeError: Failed to construct 'BroadcastChannel': 1 argument required, but only 0 present.
      at Object.requiredArguments (deno:ext/webidl/00_webidl.js:627:13)
      at new BroadcastChannel (deno:ext/broadcast_channel/01_broadcast_channel.js:81:14)
      at <anonymous>:2:1
  > close()
  

Is this a bug or just a docs problem? I searched through several pages of release notes and found only this mention in v1.11.0:

• feat(extensions): add BroadcastChannel