David M. Lloyd created MRESOLVER-578:
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Summary: Incorrect qualifier handling in `GenericVersionScheme`
Key: MRESOLVER-578
URL: https://issues.apache.org/jira/browse/MRESOLVER-578
Project: Maven Resolver
Issue Type: Bug
Affects Versions: 2.0.0
Reporter: David M. Lloyd
Starting with version 2.0.0, the resolver no longer considers the qualifier
`ga` to be equal to `0` in some circumstances.
In 1.9.6, we have this output:
```
$ jbang --main=org.eclipse.aether.util.version.GenericVersionScheme
org.apache.maven.resolver:maven-resolver-util:1.9.6 0 ga
Display parameters as parsed by Maven Resolver (in canonical form and as a list
of tokens) and comparison result:
1. 0 -> 0; tokens: [0]
0 == ga
2. ga -> ga; tokens: [0]
```
Whereas in 2.0.0 we have this:
```
$ jbang --main=org.eclipse.aether.util.version.GenericVersionScheme
org.apache.maven.resolver:maven-resolver-util:2.0.0 0 ga
Display parameters as parsed by Maven Resolver 'generic' scheme (in canonical
form and as a list of tokens) and comparison result:
1. 0 -> 0; tokens: [0]
0 > ga
2. ga -> ga; tokens: [0]
```
While this is a major version change, and incompatibilities are to be expected,
I think this should be evaluated as a possible bug. In trailing context, a zero
segment such as `ga` or `0` is considered equal to any other zero segment. When
a series of tokens is given, such as `0.0.ga`, it's not entirely clear what is
leading and what is trailing context. I think it is reasonable to expect that
`0.0.ga` == `0` == `ga` == the empty string, and thus "trailing context" should
in this case be defined to include any number of trailing zero segments, even
if there are no nonzero leading segments.
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