用于为专有XML API构建API客户端的最佳Ruby库

It seems like most (or all) of the ruby API client builder gems assume you're working with a REST API. I need to build a client library for a clunky old API that uses a proprietary combination of SOAP and XML-RPC. What is the best library available for helping me build this client library?It seems like most (or all) of the ruby API cli