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This may be the documentation: https://docs.rs/mundane/0.4.3/mundane/ It's not great, but it's something.

You're right though, they should at a minimum link to it more prominently.

I don't want to crap on the project, but it seems like good user docs would be... the second most important thing after API design in terms of making a library hard to misuse. Maybe I'm wrong here though

Documentation for Rust crates goes in a standard location (which does get linked to from the crates.io page), though of course it'd be better if you didn't have to know that in order to find it from GitHub

I went to both crates.io and docs.rs.

Documentation as is is virtually non-existent there. Unless you're already familiar with how these functions are supposed to work.

It's kind of a faux pas, I think, to claim ergonomics as a top priority and not have good quality documentation anywhere in sight.

https://docs.rs/mundane/0.4.3/mundane/