Do not decode non-ASCII-alphanumerics in Punycode labels #124
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Currently, invalid Punycode such as
ls8h=will be successfully decoded. It should fail instead.I think this comes about because
basicToDigitwas copied from C code in the punycode RFC, but that RFC uses unsigned integers, whereas JS only has signed integers (AFAIK). We need to check that the result of, say,codePoint - 0x30is not negative -- or, as done here, check thatcodePoint >= 0x30.