My first thought was that interned strings were causing the growth, but that doesn't seem to be the case.
Interned strings, as of 2.3, are no longer immortal, right? The intern doc says you have to keep a reference around to the string now, anyhow. I really wish I could find that thing I read a year and a half ago about python never collecting small strings, but I just can't find it anymore. Maybe it's time for me to go source diving...
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