On a side track: since I'm touching pretty much every file in the iocaine repo, I'm thinking about adjusting the SPDX headers, but the problem is, I'm not sure what I wish to achieve there.

Most files carry an SPDX-FileCopyrightText: Gergely Nagy, which is technically correct. But I'd wish to make it easier for others to become copyright holders. Adding their name to a header is... kind of... not great. It feels noisy, and somewhat scary. I know I am usually uncomfortable adding myself to a copyright holder list, because it feels like Such A Big Thing™, and I worry that my contribution ain't big enough.

So I might turn copyright holders into something like "iocaine contributors", or "tarpit monsters and other malicious actors". But that requires relying on git history to figure out who those people are, which isn't great, either.

I might just stick with having my name there, and if someone contributes code, I'll recommend adding themselves (or asking them if I can add them, so they don't have to force push).