anchor.diff:          int const *b, size_t const *r, size_t const *s, int *box,
           inform_error *err);
   ----
  +[horizontal]
  +Headers::
  +    `inform/utilities.h`,
  +    `inform/utilities/black_boxing.h`
   ****
   
   ****
  
positive.code: int32_t inform_encode(int const *state, size_t n, int b,
          inform_error *err);
  ----
  ****
  
  ****
  
negative.code: void inform_decode(int32_t encoding, int b, int *state, size_t n,
          inform_error *err);
  ----
  [horizontal]
  Headers::
      `inform/utilities.h`,
      `inform/utilities/encode.h`
  ****
  
  [[partitioning-time-series]]
  