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It's like a built-in unit test - devs have to not mangle and assume anything about filenames they get from the system - though they still do, I've seen multiple times how my nice umlauts get mangled or my spaces cause scripts to fail.



A few years ago I tried naming my home directory with the unicode pile of poo () and a space in the name to test what of my code might break. However, it broke too much of third party tools/scripts that I occasionally needed for something, so I reverted within a few days.

Though it might be interesting to have an integration test box where the username (and thus all the relevant paths) includes all kinds of oddities - whitespace, emoji, right-to-left marker, etc.




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