code: def Union(self, t2, off):
          
          assert type(t2) is Table
          N.enforce_number(off, N.UOffsetTFlags)
  
          off += self.Pos
          t2.Pos = off + self.Get(N.UOffsetTFlags, off)
          t2.Bytes = self.Bytes
docs: Union initializes any Table-derived type to point to the union at
             the given offset.