good first issueneeds consensusneeds specification text
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説明
The If Type(iterator) is not Object, throw a TypeError exception. step is generally not implemented by engines, see https://jsfiddle.net/gj3uaw1t/ for an example. V8 does implement this step for yield*, but not other uses of GetIterator().
It would be cool if we could remove this from the spec and have common behaviour among implementations (it seems a recent version of SpiderMonkey has added the typecheck, breaking compatibility between FF and Chrome/Safari in this very unlikely situation).