TODO

Add removal of elements...

...which I THINK is

• tricky
  • because the method chaining, together with transitioning (I THINK) means
    • we can't chain it all in one list
    • because transition does not return the original selection
    • we thus need to BRANCH in the method chaining
    • which is what the .call(…) is maybe for?
    • which is what the .join(enterFunc,updateFunc,exitFunc) avoids?