remove `.isReadableStream()` blocks from codegen, example: https://github.com/servo/servo/blob/3d94f32cfc5d14d4f349e5b757be18ff6f2a9150/components/script/dom/bindings/codegen/CodegenRust.py#L923 revert https://github.com/servo/servo/blob/main/third_party/WebIDL/readable-stream.patch
