Thanks for your attention to the issue pointed out by Sanjoy.
[…]
all minus' are below the baseline so consider it a feature
Yes this is the case in recent versions of mkiv, but in Plain TeX and mkii this is not the case: there the minus sign in \pm is aligned with the baseline.
I agree with Sanjoy and Mikael to say that it the minus sign in \pm should be aligned with the baseline: however I don’t know if this can be easily achieved.
Best regards: OK
Hans
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