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> your previous yarn.lock will be silently migrated

I hope that's not that silent, because at that point, everybody who works on that project will have to upgrade as well.

That said, shipping the light-weight POSIX-like shell will make it a lot easier for scripts to be multiplatform. That's the improvement I'm looking forward to most.

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We'll make sure to add a notice at runtime to make it clear (plus, a consequent diff at review).

Also note that we recommend using `yarn policies set-version` to enforce the version of Yarn used by everyone in your team with very little friction:

https://yarnpkg.com/en/docs/cli/policies#toc-policies-set-ve...

There's a feature I didn't know about - that's enormously useful, thanks! Now to remember applying that to all my different repo's...

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