What exactly is the status of min_specialization?

https://doc.rust-lang.org/stable/unstable-book/language-features/min-specialization.html

Reading through the github issues, I'm a bit confused. It seems like there are two features, #specialization (which is unsound?) and #min_specialization (?).

Is #min_specialization available to use in nightly? If so, where are examples ?

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You've basically got the current situation right, as I understand things. See also the min_specialization PR and this blog post by Niko.

Hopefully someone can offer up some outside examples, but the main examples I've seen are in the standard library itself.