"The `Boolean` value of the given string representation of a 
 boolean value, or `null` if the string does not represent a 
 boolean value.
 
 Recognized values are `\"true\"`, `\"false\"`."
tagged("Basic types")
deprecated("Use [[Boolean.parse]]")
see (`function Boolean.parse`)
shared Boolean? parseBoolean(String string) 
        => switch (string)
        case ("true") true
        case ("false") false
        else null;