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cmark 0.29.0 has been released (as has the same version of the spec, though the spec website hasn't updated yet) -- I've published cmark-gfm 0.29.0.gfm.0 just now which just pulls in changes made since then, and here's the commonmarker change.
(Maybe worth noting: cmark-gfm's change to safe-by-default/unsafe-via-option was taken up in upstream cmark!)