Blog post: https://nim-lang.org/blog/2019/11/26/version-104-released.html
(The Debian package is currently uploading and the Ubuntu one will follow)
Nim uses odd minor version numbers to denote development releases and even minor version numbers to denote stable releases. That is common practice, see
https://en.wikipedia.org/wiki/Software_versioning#Odd-numbered_versions_for_development_releases
That is common practice, see https://en.wikipedia.org/wiki/Software_versioning#Odd-numbered_versions_for_development_releases
I wouldn't conclude from the Wikipedia section that it is common practice, at most that it was common practice. ;-) I think not using the gaps and using suffixes instead is much more direct.
See also https://semver.org .
Just saying. I can live with Nim stable "skipping odd versions", but the versioning scheme still feels a bit odd. (couldn't resist the pun :-) )