Matthew O'Riordan

> I think it will be better if we can just expose a method like here to avoid adding complex documentation in all SDK's : ( `here` => `get` though?...

FWIW. My thinking on my comment: > We include an argument in the callback with a reference to the complete presence set anyway to encourage developers to use that when...

> The main reason the above code is broken is that it assumes the presence set is uniquified by clientId, which it isn't, it's uniquified by clientId+connectionId That's the main...

Apologies for the noise in this issue (I made a mistake). I've corrected [my first follow on comment](https://github.com/ably/docs/issues/2073#issuecomment-1839135830) Saying all that, I do think we should: * Improve the docs,...

@SimonWoolf I can add the docs, but JS does not support it currently does it without the `.all` hack, or is that the way it should be done?

Replacing in favour of #251

@paddybyers assigning to you to assign on please as I can't do this now, but I think would make sense to do so that we reducing the likelihood of introducing...

Extras is a root level attribute of the Message object. We added extras so that we had a flexible set of metadata attributes for a Message object, that could be...

`headers` is now permitted, and all other fields are now rejected by realtime. As such, rolling out documentation now to reflect this ASAP is important. cc @MarkWoulfeAbly

@tbedford is this on your radar?