Re: [w3c/webcomponents] Need a callback for when children changed or parser finished parsing children (#809)

Not sure if this is possible but would it be possible to simply capture the value of `childrenChangedCallback` immediately after the element is constructed? Then one could easily enable an optimization that doesn't bother watching the children at all if the callback isn't actually provided.

(This would be similar to the `iterator.next` changes in `for-of` loops that `.next` is only captured once at the start of the loop).

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