I discovered an exponential item dupe glitch. To recreate:

1) Select an item from within your inventory so that it's attached to your mouse cursor.
2) Exit out of your inventory.
3) Re-open your inventory. The selected item will be both in your inventory AND in your hand, allowing you to add it back to your inventory.

For some context, I created over 1 BILLION seeds in not even 2 minutes:

https://cdn.discordapp.com/attachments/902219506770903090/923436604054437948/unknown.png