psych2go/foundry-upgrades

Proxy methods: (logic and storage is separated)

1. external storage

2. transparent proxy

   upgrade function is in the proxy contract

3. universally upgradeable proxy (UUPS)

   upgrade function is in the logic/implementation contract

4. beacon proxy

   upgrade a lot of contracts at the same time

5. diamond proxy

Problems about proxy:

1. function collision
2. storage collision

Thanks Patrick Collins!