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  • Wouldn't using \@ifundefined be more standard? Commented Oct 26, 2023 at 8:18
  • @JosephWright possibly, but since it's going to be using raw \csname in the false case anyway the higher level version didn't seem to gain a lot Commented Oct 26, 2023 at 8:36
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    @JosephWright \cs_if_exist_use:cF{bm@#2} {\bm@c\@latex@warning{Unexpected ~alignment ~#2}} ? Commented Oct 26, 2023 at 10:42