[whatwg/url] IPv4 number parser on "0x0a" (#167)

https://url.spec.whatwg.org/#ipv4-number-parser

I think there's a bug in the spec here.

**```input="0x0a"```**
1. Let R be 10.
    **```R = 10```**
2. If input contains at least two code points and the first two code points are either "0x" or "0X", run these substeps:
   1. Set syntaxViolationFlag.
   2. Remove the first two code points from input.
        **```input = "0a"```**
   3. Set R to 16.
        **```R = 16```**
3. If input is the empty string, return zero.
4. Otherwise, if input contains at least two code points and the first code point is "0", run these substeps:
   _**we follow this code path**_
   1. Set syntaxViolationFlag.
   2. Remove the first code point from input.
        **```input = "a"```**
   3. Set R to 8.
        **```R = 8```**
5. If input contains a code point that is not a radix-R digit, and return failure.
    _**return failure**_
6. Return the mathematical integer value that is represented by input in radix-R notation, using ASCII hex digits for digits with values 0 through 15.


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