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Real-time multi-author editing #120
The Google Realtime API libraries (used for GDocs collaboration) might be useful: https://developers.google.com/google-apps/realtime/overview
Also have a look at https://operational-transformation.github.io/what-is-ot.html and https://neil.fraser.name/writing/sync/.
Are you sure you want to build on real-time PubSub LDP here? Remember when socket.io rolled back from using WebSockets and Server-side push to Long polling and repeating client fetches.