https://doc.rust-lang.org/std/macro.format.html

https://zig.guide/standard-library/formatting/

Rust is an example of "compiler magic" in this case.

You're right about Zig, and reading the source [1] I'm still kind of impressed how unified they made comptime / runtime.

[1]: https://github.com/ziglang/zig/blob/32a1aabff78234b428234189...