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Note some architecture, technical design and decision

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Read-receipt (remembering TX*:-)
Skype notice that over 20 users in a room may have some different in read receipt. I believe this is a limit to assume that read-receipt working reliably. And in paid version I think Skype offer much larger number.
In technical aspect, this is clever way to both notice user problem with big room (20 people and lager) and hide/reduce technical requirement on Developer side.

https://dzone.com/articles/software-rebuilding-make-it-or-break-it

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