Headers contain mysterious bytes `0x00` and `0x09`

[matchy233]

Could not be eliminated even after turning off the option for adding null byte in writeData()

  00000000   54 31 30 34  37 73 31 09  31 38 33 33  T1047s1.1833 
  0000000C   30 7C 73 63  61 66 66 6F  6C 64 5F 39  0|scaffold_9
  00000018   37 32 39 5F  63 31 5F 32  7C 2D 39 33  729_c1_2|-93
  00000024   30 7C 30 30  09 39 33 2E  31 30 30 09  0|00.93.100.
  00000030   32 33 32 09  31 36 09 30  09 31 09 32  232.16.0.1.2
  0000003C   33 32 09 31  09 32 33 32  09 35 2E 31  32.1.232.5.1
  00000048   39 34 45 2D  31 36 35 09  35 32 34 09  94E-165.524.
  00000054   54 31 30 34  37 73 31 09  31 38 33 33  T1047s1.1833
  00000060   30 7C 73 63  61 66 66 6F  6C 64 5F 39  0|scaffold_9
  0000006C   37 32 39 5F  63 31 5F 32  7C 2D 39 33  729_c1_2|-93
+ 00000078   30 7C 30 30  00 09 4D 51  4B 4E 41 41  0|00..MQKNAA
  00000084   48 54 59 41  49 53 53 4C  4C 56 4C 53  HTYAISSLLVLS
  00000090   4C 54 47 43  41 57 49 50  53 54 50 4C  LTGCAWIPSTPL
  0000009C   56 51 47 41  54 53 41 51  50 56 50 47  VQGATSAQPVPG
  000000A8   50 54 50 56  41 4E 47 53  49 46 51 53  PTPVANGSIFQS
  000000B4   41 51 50 49  4E 59 47 59  51 50 4C 46  AQPINYGYQPLF
  000000C0   45 44 52 52  50 52 4E 49  47 44 54 4C  EDRRPRNIGDTL
  000000CC   54 49 56 4C  51 45 4E 56  53 41 53 4B  TIVLQENVSASK
  000000D8   53 53 53 41  4E 41 53 52  44 47 4B 54  SSSANASRDGKT
  000000E4   4E 46 47 46  44 54 56 50  52 59 4C 51  NFGFDTVPRYLQ
  000000F0   47 4C 46 47  4E 41 52 41  44 56 45 41  GLFGNARADVEA