[petters]

Serialisation often needs additional information not present in the struct definition: for enabling backwards-compatibility and default values.

Same for command line parameters. We want documentation strings, maybe dashes in the name etc.

But that can surely be solved with a little more advanced struct

[einpoklum]

I have one word for you: attributes (which the compiler, and the reflector, know about).

[petters]

Yes you’re right. That has worked well enough in other languages