if (endOfStartRun + (hashTable.length - 1 - startOfEndRun) > maxRunBeforeFallback) {
            return true;
          }
        }

        // If this part returns true, there is definitely a run of size maxRunBeforeFallback/2.
        // If this part returns false, there are definitely no runs of size >= maxRunBeforeFallback.
        int testBlockSize = maxRunBeforeFallback / 2;