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  DB> x sprintf "%.20f %.2f", (2.675)x2
0  '2.67499999999999980000 2.67'
  DB> x sprintf "%.20f %.2f", (2.685)x2
0  '2.68500000000000010000 2.69'
  DB>

  DB> x sprintf "%.20f %.2f", (2.475)x2
0  '2.47500000000000010000 2.48'
  DB> x sprintf "%.20f %.2f", (2.485)x2
0  '2.48499999999999990000 2.48'
  DB>

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

  DB> x unpack "d", "qfffff\cE\@"
0   2.675
  DB> x unpack "d", "rfffff\cE\@"
0   2.67500000000001