[whatwg/url] How should URLs containing unicode zero width spaces be treated? (#151)

URLs containing zero width spaces result in very hard to track down problems, because the zero width spaces are not displayed in Unicode confirming tools (you need a hex editor or similar to see the zero width spaces)

For example, these two URLs are different, although they're displayed identically:

https://github.com/whatwg/url/commits
https://github.com/what​wg/url/commits

The second one has a zero width space between what and wg and gives a 404


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https://github.com/whatwg/url/issues/151