docs: @Override
      public ChronicleMapBuilder<K, V> averageKeySize(double averageKeySize) {
          checkSizeIsStaticallyKnown(keyBuilder, "Key");
          checkAverageSize(averageKeySize, "key");
          this.averageKeySize = averageKeySize;
          averageKey = null;
          sampleKey = null;
          return this;
      }