Bind request continuation methods to current domain

[kanongil]

Fix for outmoded/discuss#445.

This ensures that any built-in request continuation methods are called using the correct domain. This is needed since promises lose the domain binding when eg. reply() is called inside a .then().

[kanongil]

Note that this doesn't fix it completely for extended methods, like inert's reply.file(), though it still helps since it eventually calls reply.response().

[devinivy]

Is there a specific reason the same fix for decorations is omitted (as you've mentioned)?

[kanongil]

Mostly I only thought about it after I submitted the PR. Secondly, there is no way to know if the decoration is a continuation method, though we could just always bind the method to the domain to be safe.

Let me know if you want me to update the PR.

[lock]

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