Possible test values for double precision byte order
Every byte is unique and can easily be identified so the
original order can be recovered.

The hex digits are the bytes in memory order, retrieved by casting
a double * to an unsigned char *.

F7B6B5B4B3B2B1B0 -> -4.6865066759549292e+268
-4.6865066759549292e+268 -> F7B6B5B4B3B2B1B0
--
4.6865066759549292e+268 -> 77B6B5B4B3B2B1B0
77B6B5B4B3B2B1B0 -> 4.6865066759549292e+268
--
-2.2514110335756488e-117 -> A7B6B5B4B3B2B1B0
A7B6B5B4B3B2B1B0 -> -2.2514110335756488e-117
--
2.2514110335756488e-117 -> 27B6B5B4B3B2B1B0
27B6B5B4B3B2B1B0 -> 2.2514110335756488e-117
