I believe it's not a caveat at all. I mean you can mix and match dependencies of different editions, and there are (IMHO) very few reasons to start a new proje

I believe it's not a caveat at all. I mean you can mix and match dependencies of different editions, and there are (IMHO) very few reasons to start a new project with an old editions. For that (IMHO) very few reasons you tend to be aware of you intentionally wanting to use a old version and as such it's not a problem. Through I would say there is no real default rust editions, it's more appropriate to say crates/libraries "keep" the rust edition they where created with until explicitly changed.