> If you take your law seriously, (...)

Hyrum's law is not mine. It's a statement of fact that goes by that name already for a few decades and is noted by anyone who ever worked on production services that exposes an interface and is consumed by third parties.

> (...) this is irrelevant because the surface of abuse is on the same scale of practical infinity, so it doesn't matter that one infinity is technically smaller.

It really isn't. JSON does not support comments, thus they aren't abused in ways that sabotage interoperability. The only option you have is to support everything at the document schema level. You can't go around it.

> For example, based of the example in the quote: you could stick those directives from comments info #hashtags in stringy values, (...)

Irrelevant. You're specifying your own schema, not relying in out-of-band information.

That's exactly how a data interchange format is designed to be used.

There is no way around it. If you understand the problem domain, the fact that leaving out comments is an elegant solution to a whole class of problems is something that's immediately obvious to you.