Function read_bool 

pub fn read_bool<A, E, R>(path: &[&str]) -> Effect<A, E, R>
where
    A: From<bool> + 'static,
    E: From<ConfigError> + 'static,
    R: NeedsConfigProvider + 'static,

Boolean parsed from "true" / "false" / "1" / "0" / "yes" / "no".