it's similar to:
to some extent, except that the callbacks are able to free in my case
allowing to avoid leaks.
As an yet another example, if you use a callback wrapped by
addTimeout(timeout, cb) or future.once(cb).setTimeout(timeout) as an ACK
callback for a socket.io request that is never acknowledged, this wrapepd
callback would exist till the socket is disconnected.
Any response is highly appreciated.
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