Currently versioneer expects (all?) tags in the repository to match the given (tag_prefix).
If (the latest?) tag does not match that prefix, versioneer will not be able to derive a version.

I have a repo, in which i maintain mulltiple packages. This is waiting for a fix to #38 (dup: #109) anyway, but i noticed, that that won't be enough. I want to use separate tag prefixes for the different packages, but it seems like if i add a tag with a new prefix, the "previous" package does not get a version anymore, because it fails on the wrong prefix of the more recent tag.

Proposed fix: If a tag does not match tag_prefix, just ignore the tag.