Place prepends a value specified by `flags` to the Builder,
        without checking for available space.

def Place(self, x, flags):
        """
        Place prepends a value specified by `flags` to the Builder,
        without checking for available space.
        """

        N.enforce_number(x, flags)
        self.head = self.head - flags.bytewidth
        encode.Write(flags.packer_type, self.Bytes, self.Head(), x)