Re: [w3ctag/design-reviews] CompressStream (#410)

> For example, gzip will eventually have a filename option. It's not immediately clear to me how to handle this.

There is a small precedent here with [`canvas.getContext()`](https://html.spec.whatwg.org/#dom-canvas-getcontext), whose second argument is an optional options object. This is handled on the spec level by declaring it `optional any` and then switching on the first argument before manually invoking the Web IDL "convert _arg_ to Y" algorithm, where Y is the specific dictionary type in question (e.g. [`CanvasRenderingContext2DSettings`](https://html.spec.whatwg.org/#canvasrenderingcontext2dsettings) vs. [`ImageBitmapRenderingContextSettings`](https://html.spec.whatwg.org/#imagebitmaprenderingcontextsettings). I think that's a reasonable pattern, both for spec-writing and for web developer usage.

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