I guess. I don't like the name "yes" and I think we would have been better off with a more general name since the command is general, but now it's there, so…

However, this is independent from this optimization, "yes" already had this feature of outputting anything, I think?

But I expect this kind of accident to happen in any working system that has been long enough. This seems unavoidable. So we'd better put up with this kind of mess probably.