docs: @SuppressLint("InvalidAccessToGuardedField")
    private void logStats() {
      if (FLog.isLoggable(FLog.VERBOSE)) {
        FLog.v(
            TAG,
            "Used = (%d, %d); Free = (%d, %d)",
            mUsed.mCount,
            mUsed.mNumBytes,
            mFree.mCount,
            mFree.mNumBytes);
      }
    }