I was a little curious about that when writing this, but I'm not entirely sure if it's going away at this point. move `#[..];` to `#![..]` then I think we'll keep `name = "value"` at the top-level for now.

Semantically, "name equals value" seems like the right thing for this rather than "name with a value sub-attribute". Of course this is fairly easy to change, and I don't mind too much.