Hello.

As the example of purl-spec, urls in qualifiers should be normalized as below:

pkg:maven/org.apache.xmlgraphics/[email protected]?repository_url=repo.spring.io%2Frelease

But in packageurl-python, when I set qualifiers to {"repository_url": "repo.spring.io/release"}, and the to_string will return as below:

pkg:maven/org.apache.xmlgraphics/[email protected]?repository_url=repo.spring.io/release

If I set qualifiers to {"repository_url": "repo.spring.io%2Frelease"}, the to_string will return as below:

pkg:maven/org.apache.xmlgraphics/[email protected]?repository_url=repo.spring.io%252Frelease

Which means the letter % is normalized to %25.

Is that a bug?