Comment by a-french-anon

Where's the elegance? Equality is well defined on everything handled by those three, since they only compare the same types without doing coercion. Plus, you can't extend these to handle user types.

Which is why https://cdr.common-lisp.dev/document/8/cleqcmp.html exists, really; all the "copy-x" would benefit from the same fix, in my opinion.