Re: [whatwg/url] Disallow invalid IPv4 in IPv6 parser (#196)

I think the point of failure in your algorithm can be [Integer overflow](https://en.wikipedia.org/wiki/Integer_overflow) in step "4. Set <i>piece</i> to <i>piece</i> × 0x100 + <i>value</i>" (when invalid address has many dots). In some programming languages this can cause a run-time error.

So I preffer <i>numbers seen</i> variant.

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