booleans

https://github.com/Verseth/ruby-booleans

This gem adds a new method called `Boolean`, analogous to builtins like `Integer` or `String`, which converts a Ruby value to either `true` or `false` based on its truthiness. It also has optional core extensions that add a `to_bool` method to all Ruby objects and allow you to check if a value is boolean with `val.is_a?(Boolean)`.