You'd think that only one [osd] section in ceph.conf implies nrep = 1, though. (And then you can go on adding OSDs and changing nrep accordingly -- that was my plan.)
Yeah; it's probably mostly just that one-OSD configurations are so uncommon that we never special-cased that small user set. Also, you can run with a cluster in that state forever (well, until that one OSD dies at least); I do that regularly with the default vstart.sh local test cluster
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