Turtle inventory leftovers cause incorrect item drop

[Kan18]

If a shop owner accidentally leaves an item in the first inventory slot of a shop turtle, and somebody attempts to purchase from the shop, the turtle will dispense the item which was already in its inventory rather than give a refund.

I have a few thoughts here

• maybe try to import the turtle inventory into storage before any purchase
• maybe also validate the count of items pulled into the turtle inventory
• also validate the item with turtle.getItemDetail right before it gets dropped