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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
This reverts commit ebcca1e5.
/utf-8 is needed to deal with subprojects that we do not control, so only set it when we're not a subproject. This is the correct fix for !236 (merged).