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As of #18660,
We should resolve that difference, ideally by defining a filesystem-safe encoding for all paths currently accepted in
To be more precise, #18660 was about allowing Unicode letters within the "subdir" part of github.com import paths like "github.com/user/repo/subdir" (but not within "user" or "repo" parts).
To my knowledge, Unicode letters were allowed in vanity import paths since Go 1 or close to thereof. I tried Go 1.2.2 just now (the oldest release with binaries at https://golang.org/dl/), and it doesn't reject Unicode letters in a vanity import path: