Similar to L{writeString} but does not encode a type byte.

def serialiseString(self, s):
        """
        Similar to L{writeString} but does not encode a type byte.
        """
        if type(s) is unicode:
            s = self.context.getBytesForString(s)

        l = len(s)

        if l > 0xffff:
            self.stream.write_ulong(l)
        else:
            self.stream.write_ushort(l)

        self.stream.write(s)