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C4-742: Fix contract upgrades #32
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C4 Issues:
code-423n4/2022-12-gogopool-findings#742
code-423n4/2022-12-gogopool-findings#729
What changed
The Upgrade method now doesn't delete the address associated with the contract name just after setting it, allowing contracts to be upgraded with the same name. We also now delete the boolean value of contract exists last, so that the ProtocolDAO itself can be upgraded.
Added some additional sanity checks when upgrading and registering.