Oh, great. It seems, I managed to get only special symbol that forbidden for
Windows. :)

>I may add some kind of configuration feature for that, but >the option might
>break on some systems (on Windows, for example)

Hmm, as I see, there is only one special symbol unsafe for Unix, and bunch of
others specifically forbidden for Windows. Can you add switch like
"allow-special w|u" that will enable only this particular, system-depending
part?
And thank you for your answer! :)

Sincerely yours, Oleg Vladimirovych Bobryshev.