Understanding the ECMAScript spec, part 2 is out! https://v8.dev/blog/understanding-ecmascript-part-2 …
In this article @marjakh walks us through the prototype chain and explains how property access is defined in the spec. 
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"why the question mark?" --- this question is supposed to be answered somewhere near the end of the article, yet it's really not? The `Return ? Foo()` expansion looks semantically identical to `Return Foo()`, so why the question mark?

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