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I published my implementations of the resolution algorithms to a new npm package. I'm not sure if you'd prefer to keep the one in this repository, though. I'm using the npm package in my import.meta.url-preserving TypeScript loader. My team is using this loader internally, so I have a vested interest in keeping it up to date.
I did find a handful of errors in the specification: nodejs/node#57080, and a few other bugs in my implementation. It doesn't look it affected any packages in your test suite.