This is a bigger culture shock than the metric vs imperial system to me.
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British use 0 indexing? Never thought about it like that huh
But you would call the item at index zero the "first" element, not the "zeroth" element.
I personally call it zeroth index to about confusion, so G floor or even 0 on elevators is akin to that. But yeah, nobody would say it's the first of all the floors in the building, but not the first floor.