Looking for more crates/types to add support to multipart for. Goes without saying that I’m taking requests!

First on the list is Hyper’s client::RequestBuilder , which requires a lazy approach instead of the current eager one–ironically, multipart 's client implementation used to be lazy, so maybe I’ll go back to that or somehow provide both. I want to try static chaining a la std::io::Chain to avoid both allocations and dynamic dispatch, but I’ll probably have to provide some sort of dynamically dispatched fallback for requests which need to be built dynamically (e.g. adding fields based on runtime data).