refactor `SubscriptionClosed` (#612)
* refactor `SubscriptionClosed` I noticed that we "trying" to sending "close messages" on subscriptions that already has been terminated by the client which is unnecessary. Moreover, this introduces `fn is_closed` to check whether a given channel is closed without having to send an actual message on the channel. * cargo fmt * Update types/src/error.rs Co-authored-by: David <[email protected]> * fix nits * more grumbles * make rust stable happy * SubscriptionClosed: add deny unknown fields Co-authored-by: David <[email protected]>
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