docs: public static SingleItemSketch heapify(final Memory mem, final long seed) {
      final long memPre0 = mem.getLong(0);
      checkDefaultBytes0to5(memPre0);
      final short seedHashIn = mem.getShort(6);
      final short seedHashCk = computeSeedHash(seed);
      checkSeedHashes(seedHashIn, seedHashCk);
      return new SingleItemSketch(mem.getLong(8), seed);
    }