docs: def get_type(type_):
      """
      Gets the declaration for the corresponding custom type.
  
      @raise KeyError: Unknown type.
      @see: L{add_type} and L{remove_type}
      """
      if isinstance(type_, list):
          type_ = tuple(type_)
  
      for k, v in TYPE_MAP.iteritems():
          if k == type_:
              return v
  
      raise KeyError("Unknown type %r" % (type_,))