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c:\test>perl -E"say pack 'd<', 12345.67689" | od -t x1
0000000 7f de 54 a4 d6 1c c8 40 0d 0a
...
c:\test>perl -E"say scalar reverse pack 'd', 12345.67689" | od -t x1
0000000 40 c8 1c d6 a4 54 de 7f 0d 0a
0000012