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lang-tex
\mkern-7mu\mathchoice{-2mu}{}{}{}to\mkern-7mu\mathchoice{\mkern-2mu}{}{}{}\mathchoicealready distinguishes between display style and text style, why is\if@displaysometimes inserted in the first two options? Isn't the question of whether or not we're in display style already answered by\mathchoice?\if@displayis a completely different thing; it's used byamsmathfor different purposes.