code: def Boolean():
      
      @wraps(Boolean)
      def built(value):
          # Already a boolean?
          if isinstance(value, bool):
              return value
  
          # None
          if value == None:
              return False
  
          # Integers
          if isinstance(value, int):
              return not value == 0
  
          # Strings
          if isinstance(value, str):
              if value.lower() in { 'y', 'yes', 't', 'true' }:
                  return True
              elif value.lower() in { 'n', 'no', 'f', 'false' }:
                  return False
  
          # Nope
          raise Error("Not a boolean value.")
      return built
docs: Creates a validator that attempts to convert the given value to a boolean
      or raises an error. The following rules are used:
  
      ``None`` is converted to ``False``.
  
      ``int`` values are ``True`` except for ``0``.
  
      ``str`` values converted in lower- and uppercase:
  
      * ``y, yes, t, true``
      * ``n, no, f, false``