From: Nick Brown <ruby-forum.com@...>
Date: 2008-08-21T06:01:12+09:00
Subject: Re: unintuitive language feature (exclamation functions)

I'm starting to wonder if this is actually a bug in Ruby? The 
documentation of sub! says it should modify the string in place.

The code I posted does something different. After the a.sub!, executing 
"puts #{a}" outputs the modified version of a, but inserting that *exact 
same* string object into a database puts an UNMODIFIED version of the 
string into the DB. It's as if db.execute looks back in time to before 
the sub! when it gets the value of a. Something unexplained is going on 
here (unless the database module includes a time machine).

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