Re: [fetch] Option to require response.ok (#103)

Media elements, `<track>`, appcache and `importScripts` all fail to use body content if the status code looks like an error. `<link>`, `<object>`, `<script>` fails on 404, but it's not clear what they do with other error codes, but it seems like the intention is for them to consider other error codes to also be a failure.

Feels like there's call for this to be part of fetch to standardise what's considered and error and what isn't.

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