Back to keeping everyone in a multiplayer repl in sync. In the real world, we don't always work at the same time. Sometimes people leave then rejoin later, or lose their internet connection and come back online. When people rejoin, we need their client to "catch up" to the current state of the repl so everyone has the same code in front of them!
Can you play back what they were doing? It'd help me so much to see what my team has been changing. Especially seeing a time-scrub when doing a PR review...