Re: [url] Parsing an empty host (#79)

This would work, but:

The IPv4 parser already has three different kind of outcomes: return a string (the input unchanged, used when the input is not in the expected format), return failure (used when numbers are too large) and return an IPv4 address. Why introduce a fourth? (Abort with an assertion error, a concept that this spec didn’t have so far.) Doesn’t returning failure for the empty string have the desired effect?

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