simulateByTxBody seems broken. ABCI errors are swallowed

[k730]

1. In CosmJS I can do:

const gas = await client.simulate(address, [msg], memo);

In interchainjs I must hand-craft TxBody and SignerInfo[] for:

await signer.simulateByTxBody(txBody, signerInfos);

This is significantly more involved, and after many attempts I haven’t been able to make simulation succeed. It seems broken

2. In interchainjs, the ABCI query helper returns only result.value, silently dropping errors when result.code != 0:

// interchainjs
async request(service, method, data) {
  const path = `/${service}/${method}`;
  const result = await this.queryAbci({ path, data });
  return result.value;  // <-- when result.code != 0, error log is lost
}

This swallows log, making it impossible to diagnose why simulation failed.

Please expose a simple simulate(address, messages, opts) API (or similar).

In the request path, when code != 0, propagate the ABCI error.

Thanks!