DB> x pack "d", 2.675
0  "ffffff\cE\@"
  DB> x unpack "d", "gfffff\cE\@"
0  2.675
  DB> x sprintf "%.20f %.2f", (2.675)x2
0  '2.67499999999999980000 2.67'
  DB> x sprintf "%.20f %.2f", (unpack "d", "gfffff\cE\@")x2
0  '2.67500000000000030000 2.68'