> If I was arguing that it was reasonable, I'd have said that. I merely stated C allows it. Which it does.

That's the thing. The C standard does not allow it. The C standard merely never mentions it, which is a different thing entirely. Hence my analogy to JPEGs (which the C standard never mentions either).

And I meant the argument itself is unreasonable. It makes no sense! I could just as well argue that the TCP/IP RFCs allow fd 2 to be something other than standard error. Or the HTTP 2.0 spec. Or the Ecmascript spec. Arguing that something is allowed by a spec that never mentions it and has absolutely nothing to do with it is not an argument.