$/="\n\0"; will fail if the file contains character U+0Axx followed by U+yy00

This is correct (same holds for "\x0A\x00", btw).  However, as U+0Axx is Gurmukhi/Gujarati, this is rather unlikely to happen in the OP's case... (Also, a characteristic of a "crude hack" (as I called it) is, that it would work in most practical cases, but isn't failsafe, theoretically).

In reply to Re^3: Mysterious Whitespaces between each character in a file (hack for 5.6.x) by almut
in thread Mysterious Whitespaces between each character in a file by 1wax

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