Re: [whatwg/url] It is unlikely that the spec's two definitions of valid URL strings are equal (Issue #704)

domenic left a comment (whatwg/url#704)

I unleashed both Codex and Claude (Fable 5!) on what remains after #924, and they wrote very exhaustive-seeming fuzzers. [Claude wrote a long-winded writeup](https://gist.github.com/domenic/c2285ead47ddd80e1f5ae98062e41e57), but the summary is that they were only able to identify one remaining gap: special-scheme URLs where ToASCII turns the host into an IPv4 address. E.g., `ws://０.0.0.0`, `https://1。2。3。4`, `https://².2.3.4`, `https://①.2.3.4`, or inserting various normalized-away characters like zero-width space or the BOM.

I'm somewhat hopeful that after this we'd actually be done. But, I've thought that before...

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