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To be fair, the Racket team has described its fork more as a “set of patches” that otherwise stays in sync with the main branch of Chez Scheme. Still, as time passes, the two will naturally tend to diverge further. Whether one calls it a “fork” or “set of patches”, the result is the same: some nonzero maintenance cost will persist, and likely grow.Note that now Racket run on top of almost Chez Scheme. I think there are a few patches, but almost all the changes have been upstreamed.