@simontatham or, alternately, there is the output from mobile devices with on screen keyboards. And while the error rate spikes up 500% or more, it only tells you how much attention the human was paying to how badly their virtual keyboard fscked them while they were "typing"... 😢

@jimsalter I think typos on mobile devices are also often of the form "autocucumber replaced an entire worm with a plausible but wrong alternation" and tell you less about the cognition of the human than they do about the failure modes of the software!