Of course it could just default to private, and if you wanted something you'd have to specify that.
- I don't think that private-default is a universally (or more importantly, widely) reasonable default
- It adds another case where Rust is unopinionated and gives the user another way to do a basic function.
I like Rust for its unopionation, generally, but I think that the returns for this kind of thing diminish as you get to really boilerplate stuff.
mod foo
pub mod foo
pub(crate) mod foo