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WebAssembly specification, reference interpreter, and test suite.

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Functions defined in [embedding section](https://webassembly.github.io/spec/core/appendix/embedding.html) provide abstraction of Wasm's mechanics to embedders. However, I found a case in [JS API specification](https://webassembly.github.io/spec/js-api/) that breaks this abstraction: exposing Wasm-specific internal structure. I'm...

The table on page 188 of the [3.0 draft](https://webassembly.github.io/spec/versions/core/WebAssembly-3.0-draft.pdf) runs off the side of the page.

The text format for importing tags (section 6.6.3, wasm-3.0) is `(import mod:name nm:name (tag id? tt:tag))`, where `tag` is defined as `(tag id? x,I':typeuse)` (section 6.6.8). A tag import, would...