See: https://github.com/whatwg/url/pull/216 In certain cases, parsing a host containing invalid UTF-8 should fail. New tests are being added to the spec.
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targos commentedon Jan 29, 2017
We are relying on ICU's toASCII function for this and it doesn't fail on input like
'\ufffd'.TimothyGu commentedon Mar 19, 2017
This should no longer be an issue after #11549.