And it doesn't have to be. There should be trust that the function does what it says. If I use `printf` and don't understand how it's working internally it does

And it doesn't have to be. There should be trust that the function does what it says. If I use `printf` and don't understand how it's working internally it doesn't matter to me because I know what it does and trust it. These scripts/snippets for me are just an unofficial extended standard lib