We recently ported our app to 0.6.4, and enabled cextensions.  Our
app's memory usage ballooned, and HTTP response times with it due to
the extra load on the garbage collector.  Turns out the
DecimalResultProcessor cextension code is a bit leaky!  :)

I've opened ticket http://www.sqlalchemy.org/trac/ticket/1978
including a patch that plugs those leaks and includes tests to verify
that they're plugged.  The changeset is also available at
https://bitbucket.org/taavi_burns/sqlalchemy/changeset/c90e0cfdf9cc
for review.

I was considering marking the new tests with
@testing.requires.cextensions since nobody should expect the Python
version to leak like this.  Thoughts?

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