I don't think it is zealotry. They offer features explicitly for Rust programmers, and the major examples of the project's use are by Rust itself. > Automated

I don't think it is zealotry. They offer features explicitly for Rust programmers, and the major examples of the project's use are by Rust itself. > Automated testing of Rust code samples > mdBook is used by the Rust programming language project, and The Rust Programming Language book is another fine example of mdBook in action.