[cataflam]

Wow. Maybe I'm missing something but it seems really weird to replace a tool with a rewrite that doesn't pass the test suite!

[EraYaN]

The non-passing test was only added like 17 hours ago: https://github.com/coreutils/coreutils/commit/14d24f7a530f58...

So this is a good thing even for coreutils itself, they will slowly find all of these untested bits and specify behaviour more clearly and add tests (hopefully).