I've just added `and` to my toy lisp compiler: https://github.com/Wilfred/proper-compiler-hat/commit/af5c77e30ecbf4884e71c1177a086337aa74d237
It's just a plain function, not a macro or special form. Is that so bad? I've seen confusing uses of `and` with truthiness e.g. `(and maybe-nil (compute-default))` and I'd rather avoid that.