Er… I’ve only ever tried 2.x-3.x.
All work… some creators speak fast and I’m limited to 2.8, but others I have at 3.5 or 3.8.
Not pushed it further than that but if you want to try 1.7*10^308 you do you my dude!
Some power tips…. F12 opens and closes the console window, and in Brave browser at least it remembers your last command so you can just press the up arrow and enter to run the last command. YouTube will reset to 2.0x on each new video as that is their highest value. There are browser extensions that can do all this for you but every new extension is another possible attack vector or potentially malicious party you are adding to your digital world.