There was an issue with batch records via standard queries versus those wrapped in transactions. v1.0.1 includes a patch that checks the arguments and conditionally flattens the array for proper handling in each context.
Your feedback is greatly appreciated, so please submit feature requests and issues. If you want to contribute, even better! Pull requests are always welcome.
Full Release Notes: https://github.com/jeremydaly/data-api-client/releases/tag/v1.0.1