I'm opposed to retargeting the Debug impl. Most of the time someone using this crate cares will need one so they can slap derive(Debug) on a struct containing it, and as such clients of this crate should never have to care about the internal implementation. A debug impl that exposes the internal bitfields is primarily useful for people working on this crate itself, which is not a great tradeoff: if I'm working on this crete I can always temporarily tweak its Debug impl if I need.

Fair enough. Limited the PR to bug fix for+ separators in Debug/Display.