bug in arbtt/replaceForbidden?

[Dmitry Astapov]

Hi,

I've just started using arbtt. First of all, let me thank you for this
wonderful piece of software! From the looks of it, arbtt will end all my
time-tracking nighmares once and for all.

However, I've stumbled upon a quirk that messes up my reports: for some
reasons numbers in window titles are replaced by '_'. I believe that
"replaceForbidden" from Categorize.hs is to blame. Is it possible to replace
"isLetter" in the first clause with "IsAlphaNum", or there is some
non-obvious reason why it is written the way it is written?

-- 
Dmitry Astapov
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