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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.
No longer enforces to pass an array of references.
@slomo : I tried what you suggested yesterday and that seems to work.
If that's ok with you I'll change the other many APIs as well to this pattern.