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Summary
This is an implementation for yarnpkg/rfcs#68.
For now there is only failing tests to start things up. I'm not sure I will be able to implement it so at least I will provide the tests for someone more knowledgeable of yarn codebase to focus on the implementation itself :)
@bestander @arcanis
Test plan
There was an RFC made and discussed.
We should at least add those unit tests: