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    The double superscript error is kind of a dealbreaker, but I have to say that your method looks unnecessarily complicated to me (it could be simply because I'm new to LaTeX and this is actually considered normal).
    – Hilbert Jr.
    Commented Nov 10, 2020 at 13:26
  • @V.Ch. You have a valid point. My keyval-based approach makes the most sense when writing papers with complicated constructions like \mathcal{C}_{/X}^{\mathrm{op}} or \mathcal{D}^{b,\ge0}(X). Then I find it blessing to be able to instead write something like \catC[over=\vX,op] and \der[bounded,positive degree]{\vX}. But that is entirely a matter of taste, of course. ;-)
    – Gaussler
    Commented Nov 10, 2020 at 13:32
  • Incidentally, is there a difference between a' and a\prime? I've been using the former this whole time, but I'm noticing people using the latter in this thread.
    – Hilbert Jr.
    Commented Nov 10, 2020 at 14:21
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    In fact, a' is equivalent to a^{\prime}. Knuth made it this way precisely so that you can type a^{\prime 2} to get a'². You should never write a\prime, however, as this will put a giant prime to the right of your a.
    – Gaussler
    Commented Nov 10, 2020 at 14:23
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    @V.Ch. The Declare variant overrides any previous definitions. I guess I should have used the New variant. Updating the answer with this.
    – Gaussler
    Commented Nov 11, 2020 at 6:24