Currently the upgradeto call will only allow one row in the table, though all the code else actually anticipate it to be a normal table and try to read the last row for latest implementation.
We should fix it.
Currently if we want to upgrade deployed ERC20 contract, we need a call FROM erc2o.eosio to the upgrade API of the ERC20 contract. But we have not provided such a way.
There's several problems:
We should fix it.