Is it a problem we might call wt_evict_forced_page with a leaf page that has some number of split-merge pages above it?  That is, if wt_eviction_page_force calls wt_evict_forced_page, is it a problem if we walk to the top of a split-merge tree that has a leaf page at the bottom?   (I was just struck that we don't care what type of page "page" is, just what type its parent is.)