refactor: fix upcoming Closure Compiler type errors on Symbol.iterator #8851
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Closure Compiler will soon start typechecking well-known symbol properties, such as Symbol.iterator - see
google/closure-compiler#1737.
This will cause some type errors in existing code that implements
Iterable
(for context, I ran into these errors in google's internal repo) that is missing a Symbol.iterator override or@override
annotation