[oblio]

Zero still would most likely wooldn't make sense. Zero is nothing, it can't be anything. Even ordinally.

1 is something and it fits very well for the first position... outside of programming :-)

[xigoi]

In 1-based indexing, the index of an item is the number of items you've already seen, including the one you're looking at.

In 0-based indexing, the index of an item is the number of items you've already seen, excluding the one you're looking at.