Re: [sensors] Undefined values makes GS a pain to work with using TypeScript

> Is this a static, class-side property? If so, what happens if there are more than one instance of a given Sensor?

If there is more than one instance, then we could cache the last reading and return that, and only add default values when all sensors call stop().

> I can easily see end developers getting tripped up on this, with code that forgets to check the "hasReading" signaling property :\

That is just as bad today. You can easily forget to check whether .z is set or not. I know because I have done it when doing sensor fusion.

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