If you try to sell someone "gravity set to negative height per second squared" and "gravity set to positive height per second squared" as two separate features in your physics engine, they are not going to be impressed.
I meant if objects falling upwards were a bug. Or for that matter if the objects move sideways.
To me it's clear that the feature is items go down. If there is any scenario (bug) in which items move upwards or sideways, obviously there is no feature that makes them go sideways. It's a runtime behaviour.
Oh if they're going sideways or glitching up for other reasons then no it's not an aspect of the gravity feature, agreed.
And I think the aspects of this discussion more directly tied to the article are being better addressed in the other comment chains so I won't continue that here.
