Documentation: null/empty/absent data and multiplication

Thank you for miller! The documentation states that empty works like 0 for multiplication: https://github.com/johnkerl/miller/blob/e7fe363d9a65ef6693e3de7528b6c49b0dc948a8/docs/src/reference-main-null-data.md?plain=1#L128 but the example shows that empty works like 1 for multiplication: https://github.com/johnkerl/miller/blob/e7fe363d9a65ef6693e3de7528b6c49b0dc948a8/docs/src/reference-main-null-data.md?plain=1#L131 https://github.com/johnkerl/miller/blob/e7fe363d9a65ef6693e3de7528b6c49b0dc948a8/docs/src/reference-main-null-data.md?plain=1#L134 Which one of these two behaviours is the intended behaviour?