RpcClient::simulate_bundle returns error

[buffalu]

Problem

let bundle = VersionedBundle {
  transactions: vec![tx.clone()],
  };
 let sim = rpc_client.simulate_bundle(&bundle).await.unwrap();

returns the following error:

ClientError { request: Some(SimulateBundle), kind: RpcError(RpcResponseError { request_id: 1, code: -32602, message: "pre/post_execution_accounts_configs must be equal in length to the number of transactions", data: Empty }) }',

This is because simulate_bundle with no config fills out the default config as:

RpcSimulateBundleConfig {
                simulation_bank: Some(SimulationSlotConfig::Commitment(self.commitment())),
                ..RpcSimulateBundleConfig::default()
            }

and the validator runs the following check:

if !(config.pre_execution_accounts_configs.len()
                == rpc_bundle_request.encoded_transactions.len()
                && config.post_execution_accounts_configs.len()
                    == rpc_bundle_request.encoded_transactions.len())
            {
                return Err(Error::invalid_params(
                    "pre/post_execution_accounts_configs must be equal in length to the number of transactions",
                ));
            }

Proposed Solution

in simulate_bundle, we can have it fill out pre_execution_accounts_configs and post_execution_accounts_configs with vec![None; bundle.transactions.len()] or handle that better in setting the defaults when the simulate_bundle RPC call is made in the validator