ReplaceBlockTag does not return an additional *JSONRPCRequest, as it already changes the receiving parameter "req"
no need to run CheckBlockNumberFromResponseFromHashCalls when response.Result is nil (CheckBlockNumberFromResponseFromHashCalls also checks if response.Result is nil as a first instruction)
do not include result in RPCResponse when there's an error
include result: null when the underlying L1 node returns it
ReplaceBlockTagdoes not return an additional*JSONRPCRequest, as it already changes the receiving parameter "req"CheckBlockNumberFromResponseFromHashCallswhenresponse.Resultisnil(CheckBlockNumberFromResponseFromHashCallsalso checks ifresponse.Resultisnilas a first instruction)resultin RPCResponse when there's an errorresult: nullwhen the underlying L1 node returns it