Re: [w3ctag/design-reviews] WebAssembly js-types API (#532)

```
function print(...args) {
  for (let x of args) console.log(x + "\n")
}

let table = new Table({element: "anyfunc", minimum: 10});

let print_i32 = new WebAssembly.Function({parameters: ["i32"], results: []}, print);
table.set(0, print_i32);
let print_f64 = new WebAssembly.Function({parameters: ["f64"], results: []}, print);
table.set(1, print_f64);
let print_i32_i32 = new WebAssembly.Function({parameters: ["i32", "i32"], results: []}, print);
table.set(2, print_i32_i32);
```

In the above example where  you are exporting a JS function to Wasm, wouldn't it makes sense it I could supply meta data (in the `WebAssembly.Function` call) that would be given to the `print` method when run? 

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