Where is some definitive document on callback priorities, response priority

After spending a couple of months solving the puzzle at the end of Chapter 12.2,
I finally solved it in two ways.
1. Suggested by Joachin Small World - use #cancelButton and, rely on priority
-5, and use `self handleAnswer: false`
2. Suggestion by Lukas Renggli to simply use a copy in the editor and replace
the collection entry corresponding to the contact.

The problem I face is that there is little documentation on how priority is used
and assigned in both #cancelButton and in #response.

Thanks

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Julian Fitzell <jfitzell <at> gmail.com> writes:

>
>
> Hi Fritz,For callback priority, just look at subclasses of WACallback
(#priority
method).I'm not sure what you mean by priority of responses...Julian

Thanks Julian - I always enjoy your postings.

I had looked at priority in the WACallback - I was looking fro some design or
architectural  document. There was nothing to indicate that #cancelButton would
set priority -5 (or what -5 means). And how does it affect AJAX which is also
at -5. etc.

As to #response, once you message #response, the rest of the processing is
not done - callbacks,etc.