Code bloat

I'm not sure what is causing bloat but wasm-bindgen itself can produce smaller files.

The two examples on https://rustwasm.github.io/2018/09/26/announcing-web-sys.html are even smaller at 152 and 113kb. Both of those would likely be much bigger in JS.

I suspect the interfaces themselves are still being generated and included in the binary perhaps. The library here should be a near zero cost abstraction as far as I understand it.

Start by reproducing the reported binary sizes and compare them with the two wasm-bindgen examples linked in the issue. Inspect whether the generated interfaces are included in the output, then measure the result after any investigation; done means identifying the source of the bloat and confirming a smaller generated binary.

Written by the indexing model from the issue text.