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  bf1 = into->bitmap;
  bf2 = other->bitmap;
  for (i = 0; i < n; ++i) {
      bf1[i] |= bf2[i];
  }

  return 0;
}


/* Floodyberry's public-domain siphash: https://github.com/floodyberry/siphash */
static inline uint64_t
U8TO64_LE(const unsigned char *p)
{
  return *(const uint64_t *) p;
}

#define ROTL64(a,b) (((a)<<(b))|((a)>>(64-b)))

uint64_t
bl_siphash(uint64_t k0, uint64_t k1, const unsigned char *m, size_t len)