1407
D or d come on
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so if linux stores file names as arbitrary bytes them could I modify a ext4 fs to include a / in a file name
If you did it would likely break something as it's one of only two characters not allowed in a file name (the other being null).
You can do a lot of funky stuff within the rules though, think about control characters, non-printing characters, newlines, homographs, emojis etc. and go forth and make your file system chaos!