code: def VectorLen(self, off):
          
          N.enforce_number(off, N.UOffsetTFlags)
  
          off += self.Pos
          off += encode.Get(N.UOffsetTFlags.packer_type, self.Bytes, off)
          ret = encode.Get(N.UOffsetTFlags.packer_type, self.Bytes, off)
          return ret
docs: VectorLen retrieves the length of the vector whose offset is stored
             at "off" in this object.