OK - original and packed are the same
    0x61    0x61
    0x62    0x62
    0x63    0x63
     0xa     0xa
Not OK - original and unpacked differ
    0x61    0x61
    0x62    0x62
    0x63    0x63
     0xa        
==================================================
OK - original and packed are the same
    0x61    0x61
    0x62    0x62
    0x63    0x63
     0xa     0xa
    0x64    0x64
    0x65    0x65
    0x66    0x66
     0xa     0xa
Not OK - original and unpacked differ
    0x61    0x61
    0x62    0x62
    0x63    0x63
     0xa     0xa
    0x64    0x64
    0x65    0x65
    0x66    0x66
     0xa