Funny behavior with multiple browser windows/tabs

[bwaidelich]

I was trying out the "Todo note-taking app" example and was wondering about the unreliable behavior:
Sometimes todos didn't appear and a refresh led to a blank screen (see https://twitter.com/bwaidelich/status/1227653864423292929)

It turns out I had the app open in multiple browser tabs and the web worker decided to talk the the other instance.. Sometimes.. very entertaining but also quite confusing stuff :)