Nice. What’s the use case?

As it stands, it doesn't look like there is one. It appears to be a recreational mathematical toy for the creator to learn things more than it is for others to play with. It's kind of neat nonetheless. I think I might have made different choices for the reversal calculations, but I haven't really thought about how I'd implement those choices, nor about nigh-insurmountable edge cases, and I'm only vaguely thinking about the "c = a OP b" case, not anything more extreme. The creator may have wanted to make the same choices but found themselves forced down a different path. Verbatim from the creator: "it is imperfect".