ASCII digits only for versions

[elharo]

Everything else is treated alphabetically.

[cstamas]

Pls don't forget spec, change it as well if you do updates to implementation that maybe needs to go there as well:
https://github.com/apache/maven-resolver/blob/master/maven-resolver-util/src/main/java/org/eclipse/aether/util/version/package-info.java

[cstamas]

@dmlloyd ping

[elharo]

Addition to spec (not change as we never actually specified this) is waiting for review in apache/maven-site#661

[cstamas]

Well, let me just explain:

• Maven2 had version implementation, that in Maven3 was moved to maven-artifact
• Maven3 also introduced Maven Resovler that ALSO implemented version
• in Maven3 "universe" there are 2 parallel (and literally duplicate) implementations, and Resolver is the "right thing" (as all the plugins moved to use it, see https://cwiki.apache.org/confluence/display/MAVEN/Maven+Ecosystem+Cleanup)
• In Maven4 (due compatibility for mvn3) the maven-artifact is still there, but yet another Maven4 API for Versions are introduced, that are fully delegating to Resolver Version.

And similar mess exists in doco. What we tried here in "spec" to have one formal spec, as Maven site and plugins all over the place do have some "sort of doco" about it, but not was complete and formal.

Hence, same effort should be done on site as well, to have one spec, one thing documented, and not multiple (many times contradicting or incomplete) pages about the same thing.

[dmlloyd]

As what one might refer to as a "frequent complainer" when it comes to the version scheme, I think this change seems reasonable and shouldn't negatively impact anything that I'm aware of.

[elharo]

Thanks. I was unaware of the package.info spec. I added these cases to it.