Rejecting Promises with a closed/closing stream

[shampson]

There's nothing about rejecting Promises, but this seems to be appropriate when the [[Readable]] or [[Writable]] slots transition from true to false. Here's the cases I see:

Rejecting WaitForReadable Promises

• If reset() is called we can no longer read
• If the stream transitions to the closed state we can no longer read
• If the stream transitions to the closing state we can no longer read (receiving a FIN or RST_STREAM)

Rejecting WaitForWritable Promises

• If closed() or reset() is called then we can no longer write
• If the stream transitions to the closed state then we can no longer write
• If the stream transitions to the closing state we can no longer write when receiving a RST_STREAM