docs: public boolean needMerge(@NotNull final BasePage left, @NotNull final BasePage right) {
          final int leftSize = left.getSize();
          final int rightSize = right.getSize();
          return leftSize == 0 || rightSize == 0 ||
              leftSize + rightSize <= (((isDupTree(left) ? getDupPageMaxSize() : getPageMaxSize()) * 7) >> 3);
      }