A little more time and space gained by cutting out seq entirely and
pre-generating the argument lookup table. At least, in uncompiled use
cases.
The original implementation used regexp to lookup arguments, which
was (relatively) expensive. By comparison, using `assq` is *much*
faster, especially for datasets this small; and more so when I get
around to byte-compiling Doom's core (assq has its own byte-compiler
opcode).
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