Re: [whatwg/fetch] preload, destinations, and module scripts (#486)

@domenic the argument there seems to jump to some conclusions already.

> @rniwa the above discussion goes into some fairly extensive detail on why rel=preload as=modulescript can't work, but I guess it was not summarized nicely for newcomers. Let me try. Here are the main reasons why rel=preload as=modulescript doesn't work.

> We need to populate the module map, not the preload cache/HTTP cache. In particular, this means that the preload processing model, which e.g. re-fetches whenever various attributes change, does not make sense, since the module map is immutable.

I don't see it as obvious that this is a necessity. Can a preload cache not be used by the module loading algorithm to populate the module map?

> We need to fetch all the dependent modules, not just the single resource pointed to by the link tag; the processing model for rel=preload does not allow this.

As discussed, above a simple solution may be to simply skip this.

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