s/should/SHOULD/ in a few spots, also a s/should/must/ #614
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The capslock changes speak for themselves. I tried to avoid situations where deliberately capitalizing SHOULD were too prescriptive.
As for the s/should/MUST/, I think it's appropriate here as there will never be a situation where aborting on invalid keys is a thing that is allowed. I hope you agree that this is an appropriate change.
Thanks!