Investigate special-casing algorithm for some pathological cases

I want to investigate the following morphs, how they perform now, and if we can improve performance by special-casing any of them:

Setup: A `

` with 100 `
• ` children
  1. Append a new item to the end
  2. Remove the last item
  3. Prepend a new item to the beginning
  4. Remove the first item
  5. Insert a new item in the middle
  6. Remove the middle item

  I think the current algorithm will do very well on some of these, and terrible on others. I'd like to see if we can improve performance by doing a little planning at the beginning of `morphChildren`, and then selecting a more optimal strategy.