Fix, generator closing yield from not fully compatible
Fix, generator closing yield from not fully compatible

* The generator must be marked as running while it's closing
  its yield from. All fast paths were not doing that.

* More debugging improvements added for generators.

* Start dedicated close method for generators, to use instead
  of external interface.

* Faster closing of generators without going through the method. This
  is an optimization that more types should get.

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