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Re:Why I Don’t Talk to Google Recruiters by captn3m0 on Tuesday February 21, 2017 @01:55PM (#13698340)
Funny you point this out. Google's JSON Style guidelines[1] say this:

>If a property is optional or has an empty or null value, consider dropping the property from the JSON, unless there's a strong semantic reason for its existence.

[1]: https://google.github.io/styleguide/jsoncstyleguide.xml?show...

Re:Why I Don’t Talk to Google Recruiters by perfmode on Tuesday February 21, 2017 @02:00PM (#13698407)
That's a different issue. The commenter is referring to keys that can take on null.

This style guide entry suggests a course of action in the event that one of these keys currently has a null value.

The style guide isn't prohibiting nullable keys.