Jean-Sébastien Bour

> this derive attribute conversion would be useful only for the metrics, as we would be using tokio-tracing for logs, and possibly for traces too. I admit I use otel...

I added `RelativeEq` support, they mutualize nicely so `UlpsEq` should be pretty straightforward. I also added support for generics, but TBH I don't really know where to go from there,...

Hey, > Changing the properties type would be a breaking change :( We might need a breaking change for upping the mrsv so maybe it's a good time for it....

> That looks awesome! Would allow for preserving behaviour in case someone prefers alphabetical for some reason. Unfortunately that can't work, or I didn't find a way. At the end...

I added a `PropertiesMap` type alias for everything that's (extra) properties, and a `preserve_order` feature that changes it to `IndexMap`, tell me what you think! I didn't change the other...