Re: [whatwg/fetch] More informative error types (#526)

@mattto 

> ```fetch(...).catch(err => { err instanceof TypeError; })```

I feel it very strange because currently TypeError is the only error type fetch throws (except for AbortError, right, but it's still not very popular I guess...). The only usecase I can image except for testing is checking whether the error is thrown by fetch, together with statements that may throw errors other than TypeError, so that should be more complicated. Also, we need to care about `.name`, I think.


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