Difference in version numbers?

[Kostis]

Hi!
Why the difference in the version numbers between the stable and the developer version? One is 1.6 and the other is 1.7. I would expect something like 1.6.1.1332143 instead of 1.7. 
What are you guys up to? 

[vsub]

Odd numbers are used for betas

[Bositman]

We've been up to that for like 11 years
https://forums.pcsx2.net/Thread-blog-New...se-pattern