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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.
Much of the pixel_checker code in test/utils.c needed to be rewritten to support non-uint32_t formats.
I've broken up this change into a number of smaller commits; each intermediate step should still build and pass tests.