Invisible characters must be specified to be visible in security-sensitive situations

Oren Watson via Unicode unicode at
Thu Feb 15 16:33:12 CST 2018

You could disallow these characters in filenames, but when filename
handling is charset-agnostic due to the extended-ascii principle this is
impractical. I think a better solution is to specify a visible form of
these characters to be used (e.g. through otf font variants) when security
is of importance.
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