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We currently have gpl, gpl-2 and gpl-3 tags. Is it useful and helpful to have these tags, or should we stick to only one tag for all versions. If we shouldn't, then can we make them synonyms?
A related question is whether the individual Creative Commons licenses should get their own tags or not.
The topics of compatibility and incompatiblity of GPLv2 and GPLv3 and the difference of licensing under GPLv2-only or GPLv2-or-later are possible.
But I'm not sure if they are relevant enough to warrant individual tags for each license version.
With no volume, they should be synonyms. We can de-synonymize it once the need arises. In your case, we only need:
gpl <- gpl2 <- gpl3