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You could still do it as a userland feature and implement add/sub/mult/div as methods on the type.

That never works as well as having it built into the compiler.

Well, you're free to revive this issue: https://github.com/c3lang/c3c/issues/1451. I'd need a more solid proposal.

You can define your own "built-ins" types and functions(!) so that should make it indistinguishable.

You can also extend the standard Library from inside your own project, modules are open for extension