For it to silently fail of course though, he would have had to explicitly used the OffsetArrays package and explicitly switched all `Array`s to `OffsetArray`s (

For it to silently fail of course though, he would have had to explicitly used the OffsetArrays package and explicitly switched all `Array`s to `OffsetArray`s (which hopefully you would notice) -- and then you would have to go ahead and use those OffsetArrays in a package which doesn't support them; if you just go ahead use 0 as an index in plain Julia code it will error as you would expect.