argument_count proc(args Args) usize {
    return args.values.len
}

#! returns a borrowed, zero-terminated slice, valid while the supplied argument storage lives.
argument proc(args Args, index usize) ?[;0]u8 {
    if (index >= argument_count(args)) return null
    pointer :: args.values[index]
    length := usize(0)
    while (pointer[length] != 0) length += 1
    return pointer[..length;0]
}