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So, in short, the rationale would be a "fixed" alignment with the "dot" when displaying the version as an "8.3" file.
I think this is far too complicated. 
Let's just treat it as a build number that gets incremented when the disk image is changed for each release i.e. 148 => 149 => ... => 999 => 1000 => 1001 etc. After all, its sole purpose is to uniquely identify the image that one is having.