Return a list of values for the given key.

        If `type` is not None, all values will be converted by calling `type`
        with the value as argument. if type() raises `ValueError`, the value
        will not appear in the result list.

def getall(self, key, type=None):
        """Return a list of values for the given key.

        If `type` is not None, all values will be converted by calling `type`
        with the value as argument. if type() raises `ValueError`, the value
        will not appear in the result list.
        """
        values = []
        for k, v in self._items:
            if k == key:
                if type is not None:
                    try:
                        values.append(type(v))
                    except ValueError:
                        pass
                else:
                    values.append(v)
        return values