Pre-RFC: `pub(api)` visibility, and static enforcement of crate-internal API boundaries

For reference, here’s the issue I’m thinking of: Suggestion: Split unreachable_pub lint into multiple lints · Issue #112615 · rust-lang/rust · GitHub

I pretty much agree with @jplatte w.r.t. why I use the lint.

(The lint no longer triggers on public fields of private types, unless I’m sorely mistaken, but it still triggers on public methods of private types.)