message: bring bytes to string auto conversion back
diff: +# cython: c_string_type=str, c_string_encoding=ascii
  +
  from libcpp.vector cimport vector
  from libcpp.string cimport string
  from libcpp cimport bool
  -# ccython: c_string_type=str, c_string_encoding=ascii
  -
  cdef extern from "<stdint.h>":
  ctypedef unsigned long long uint64_t
  