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This significantly reworks the datastructures used to encode the historical stdlib data, so that we can include dependencies and weak dependencies for all stdlib versions. This will be used by Pkg to properly resolve transitive dependencies of stdlibs.
This also changes
HistoricalStdlibVersions
to register the data structures withPkg
on load. This simplifies things greatly, and also allows us to maintain a single location that knows how to deal with multiple differentPkg
versions, as only Julia v1.12+ will know how to use the newer datastructures here.