Pkg3 associates versions with git trees, which means, among other things, that the tree can be a subdirectory of a git repo, not just the root directory. So it would be possible to have an Arrow.jl subdiretory of the main arrow repo which has the standard Julia package layout. It doesn’t need to be named Arrow.jl either, it could be named julia to match the convention in that repo. We don’t really have much tooling support this yet, so it may be better to wait a bit, but this could also be a test case to drive the development of such tooling.
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