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This is a first step for #6593, the changes in DumpPackage are not done here, because a first move was to bring some types closer to cabal, step by step.
This includes 2 major changes :
The second change is also a refactoring towards better type safety and documentation. It should also increase overall stack's speed by two aspects : better memory layout with ShortText, and less translation work from cabal.
Indicative integration tests speed:
1185 ubuntu
951 macos
1491 windows
So this corroborates a small speedup (compared to baseline #6615)