Vector retrieves the start of data of the vector whose offset is
           stored at "off" in this object.

def Vector(self, off):
        """Vector retrieves the start of data of the vector whose offset is
           stored at "off" in this object."""
        N.enforce_number(off, N.UOffsetTFlags)

        off += self.Pos
        x = off + self.Get(N.UOffsetTFlags, off)
        # data starts after metadata containing the vector length
        x += N.UOffsetTFlags.bytewidth
        return x