Re: [url] IPv4 parser and the empty string as input (#96)

This is a duplicate of #79 in a way, but I'll leave it open for now.

There's one question here as I see it:

1. Should other standards be able to directly invoke the IPv4 parser? (Inclined to say no.)

If they cannot, then it's simply a matter of making sure that either IPv4 handles it or the host parser never invokes it with the empty string.

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