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The macro \mathchoice is known to be quite slow because it must typeset all four possible cases (as mentioned in The TeXbook—though I am unsure how it is implemented in modern versions). Additionally, the following code does not work as intended:
\def\foo{}
\[
\mathchoice{\def\foo{D}}{\def\foo{T}}
{\def\foo{S}}{\def\foo{SS}}
\]
\foo % It may return `D'Therefore, I would like to inquire whether the LaTeX 3 Project has any plans to re-implement this macro \mathchoice to improve its efficiency or behavior.
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