casper should be an array of contracts in authority, just in case the casper contract gets updated by the Ethereum foundation, casper has to be updated in authority and users need to be able to withdraw from the old contract.
this adds a bit of complexity and might not be needed, need to think if it makes sense
one alternative would be that the function withdrawFromCasper can call any contract and not just the casper contract, but this could add unexpected behaviour from malicious contracts
casper should be an array of contracts in authority, just in case the casper contract gets updated by the Ethereum foundation, casper has to be updated in authority and users need to be able to withdraw from the old contract.
this adds a bit of complexity and might not be needed, need to think if it makes sense
one alternative would be that the function withdrawFromCasper can call any contract and not just the casper contract, but this could add unexpected behaviour from malicious contracts