There are Only Four Billion Floats–So Test Them All! https://randomascii.wordpress.com/2014/01/27/theres-only-four-billion-floatsso-test-them-all/ (exhaustive testing can prove absence of bugs!)
miniblog.
Related Posts
Intentional variable shadowing, sorting floats, and other reflections on writing Rust: https://rcoh.me/posts/thoughts-on-rust-a-few-thousand-lines-in/
To my surprise, Emacs does not use tagged values for floats, like JS implementations. Instead, it uses structs!
Accessing individual bits in floats using constexpr https://brnz.org/hbr/?p=1518 (rather tricky, but a great exploration of float representation)