Unscientific, but: mir$ bzr log --include-merged | grep committer: | sed 's#.*<##' | sort -u | wc -l 59 vs. wayland$ git log --format='%aN' | sort -u |

Unscientific, but: mir$ bzr log --include-merged | grep committer: | sed 's#.*<##' | sort -u | wc -l 59 vs. wayland$ git log --format='%aN' | sort -u | wc -l 105 (And there's some messiness in the bzr output that inflates the mir figure somewhat.)