They aren't seperated by version because hacks for pior versions do work on new ones most of the time. Seperation by version would mean many more threads, and would make it harder to find hacks imho.
Also, doing it all in one thread is better for the end user imo, because all pior problems with fixes associated with them (hack z conflicts with hack x for example) are in one place, instead of scattered over multiple threads.
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