Stop accepting deprecated Mark JSON format
Stop accepting deprecated Mark JSON format

adrianheine/prosemirror,adrianheine/prosemirror,kiejo/prosemirror,tzuhsiulin/prosemirror,adrianheine/prosemirror,mattberkowitz/prosemirror,tzuhsiulin/prosemirror,tzuhsiulin/prosemirror,kiejo/prosemirror,salzhrani/prosemirror,jacwright/prosemirror,kiejo/prosemirror,mattberkowitz/prosemirror,jacwright/prosemirror,salzhrani/prosemirror,salzhrani/prosemirror