For those unfamiliar with Nan-boxing https://anniecherkaev.com/the-secret-life-of-nan https://anniecherkaev.com/the-secret-life-of-nan > One use is NaN-boxing

For those unfamiliar with Nan-boxing https://anniecherkaev.com/the-secret-life-of-nan https://anniecherkaev.com/the-secret-life-of-nan > One use is NaN-boxing, which is where you stick all the other non-floating point values in a language + their type information into the payload of NaNs. It’s a beautiful hack.