Re: [uievents] Expose 'direction-inversion' in wheel events (#57)

I agree it's important to make sure this API doesn't need to lie.  But at the same time, I'd hate to hold back the experience on the web on some devices due to design limitations of just one OS ;-).   Would a tri-state property (maybe `true`, `false` and `undefined`) address your concern here?

Then again, if the only people who will really ever benefit from this API are MacOS, ChromeOS and Linux users, then that makes it pretty low priority for me (in terms of impact).

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