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Importing
RealModule
without@_implementationOnly
in Swift 5.10, but with@_implementationOnly
in Swift 5.9 doesn't make sense to me. With@_implementationOnly
the dependency is hidden from dependents entirely. Without it, the dependency is exposed to dependents. If in practice it is ok to expose theRealModule
dependency to dependents (as it seems it must be) then it would be more consistent to simply remove@_implementationOnly
for <= 5.10, rather than having different semantics for 5.10 and <= 5.9.