Copied from https://github.com/hyperledger-labs/go-perun/issues/332 ### Location https://github.com/hyperledger-labs/go-perun/blob/9349d86249e080d3fc93d8d5ac82197a0c07f0d0/backend/ethereum/channel/contractbackend.go#L38 ### Problem We just set a default, very high gasLimit for all calls. ### Proposal Set a more appropriate gas limit per call.