[Backport 2.20-maintenance] #912 allow leading period #9891
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(cherry picked from commit b13e6a7)
Gen::just is the constant generator. Don't just return that! (cherry picked from commit 69bbd58)
Gen::just is the constant generator. Don't just return that! (cherry picked from commit 8406da2)
As discussed in the maintainer meeting on 2024-01-29. Mainly this is to avoid a situation where the name is parsed and treated as a file name, mostly to protect users. .-* and ..-* are also considered invalid because they might strip on that separator to remove versions. Doesn't really work, but that's what we decided, and I won't argue with it, because .-* probably doesn't seem to have a real world application anyway. We do still permit a 1-character name that's just "-", which still poses a similar risk in such a situation. We can't start disallowing trailing -, because a non-zero number of users will need it and we've seen how annoying and painful such a change is. What matters most is preventing a situation where . or .. can be injected, and to just get this done. (cherry picked from commit f1b4663)
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Automatic backport to
2.20-maintenance, triggered by a label in #9867.