Submitted by gpersoon
The contract Wand defines a few role constants with bytes4(keccak256("...function..."))
However if the function template would change slightly, for example when uint128 is replaced by uint256, then this construction isnt valid anymore.
It is safer to use the function selector, as is done in EmergencyBrake.sol
Recommend using function selectors in Wand.sol.
alcueca (Yield) confirmed and patched:
