Namespace munging
Currently gensyms have been tried to isolate namespaces, here is another proposal: hash-munging.
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As usual sort deps in dep-order. The roots have no deps other than core clojure namespaces, compute a hash of the source and append that hash to the namespace name.
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For their dependents, first replace occurrences of the original namespaces by their hash-munged ones, then compute their own hashes like in step 1.
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repeat until no more namespaces left.
This has the advantage of being a deterministic process. It means that if unrelated extensions have the exact same dep it will be loaded only once because the hash would be equal.
Also since the hashing of a namespace captures the hashes of its deps (step 2 being performed prior to hashing) it makes a hash to reflect not only a version of a namespace but the whole configuration of deps.