Why this page exists: A player needs the inventory cap before buying, copying, or discarding another snack.
The official 10-snack cap
The last pre-launch update explicitly sets the limit at 10. It also describes trashing excess snacks when a player receives one from the Gift Shop or a pick-one reward.
That is an inventory rule, not a claim that every snack effect stacks in the same way.
What v1.0.3 changed
The v1.0.3 notes name a fix for copied snack gain that could push the count beyond 10. The patch confirms the intended cap but does not publish a formula for the order in which snack effects resolve.
Keep formula claims out until tested
The reviewed official sources do not establish whether every duplicate effect is additive, multiplicative, or ordered by acquisition. A future formula page needs a current-build test matrix rather than inference from the cap.