GNOME used to use point releases numbers and decided to switch to full releases numbers, as the changes made in 40 were big enough for the different naming scheme, and they wanted to separate GNOME version releases and GTK version releases, as they were more often than not used interchangeably.

So instead of 1, 2, 3, 40 it was 3.34, 3.36, 3.38, and 40 instead of 3.40.

Windows and Apple: Skips 9
Samsung: Skips 11, 12, 13, 14, 15, 16, 17, 18, 19

they can’t count