Iterable DOM collections types #1409

Job	Run time
list-branches	8s
Build for master	6s
Build for proposals-types	5s
Build for data-view-clamped-stage-2	7s
Build for v4	5s
Build for json-source-stable	8s
Build for v4-types	30s
Build for web	8s
Build for v3	8s
combine-pages-and-deploy	19s
	1m 44s

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