https://developer.apple.com/library/archive/technotes/tn2420/_index.html
I found this apple doc for the versioning and that the version number can x.y.z, but I saw some apps in App Store with 4 part versions also.
Can you please confirm that the 4 part version is not supported or if there is a recent update documentation for it. And also 18 char limit is including the (.) periods, and regardless of individual part but limit is on total and major.minor.patch can be any length as long total length is upto 18 chars.
