Does modern JavaScript have a terse way to get an object's property and raise an exception if that property doesn't exist?
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I'm not sure what that means. What's a non-enumerable property?
Short version: Properties that aren't included in when doing `for (key in obj)`, mostly symbols. An easy example is the length property of an array
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Oh, I guess that's what the words mean, but as usual I didn't even think of the possibility that a language would actually be designed this way...
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It was less of an intentional original design, and more something that became concrete as the language matured (I believe ES5 was when it became a concrete thing you can control and query)
End of conversation
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