I'm not sure I like the `$1` and shell function pattern. It might avoid the -I minilanguage, but at the cost of "being clever" in a way that takes a minute to w

I'm not sure I like the `$1` and shell function pattern. It might avoid the -I minilanguage, but at the cost of "being clever" in a way that takes a minute to wrap your head around. It's a neat trick, but I don't think it would be easy to understand if you are reading the code for the first time.