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Current Go vendoring already allows two versions of a package to be used at the same time, and it is problematic. Both copies of the package will run their initialization, which works if they are completely self contained, but if they interact with any other global state things can start going wrong. You mutexes protecting external global resources don't work, because they are in different namespaces. These and similar problems are why common wisdom is that libraries should not pull in vendored dependencies.

So yes, attempting to allow multiple versions of the same module will cause grief.

You would also need to work around a way to override the choices made by dependencies, eg. to rebuild with security or bug fixes, without requiring me to fork everything.




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