That’s a good start, but unless I’m misreading it[1] the range of homoglyphs it checks for is rather small. You might be better off importing the Unicode Consortium’s list of ‘confusables’[2] if you’re planned automated linting.

[1] https://github.com/NebulousLabs/glyphcheck/blob/f6483dd9e97a...

[2] http://www.unicode.org/Public/security/latest/confusables.tx...

Whereas, in Perl, we have a module for executable whitespace: http://www.perlmonks.org/?node_id=270023

Damian Conway is a wonderful mad genius.