My belief is that it is about builtin functions that are provided by the compiler versus part of the standard library. They are documented in the language refer

My belief is that it is about builtin functions that are provided by the compiler versus part of the standard library. They are documented in the language reference [0] versus in the standard library documentation [1]. [0]: https://ziglang.org/documentation/master/ https://ziglang.org/documentation/master/ [1]: https://ziglang.org/documentation/master/std/ https://ziglang.org/documentation/master/std/