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I disagree with user gustaebel.  We should be adding
automatic truncate calls for all possible supported
platforms, in all places where it could make sense.  Be it
in tarfile, zipfile, where ever we can.  It would make sense
to write a function that can be called by all of those
modules so that there is only one place to update if/when
changes occur.  If the function were not part of the public
Python API, then it wouldn't need to wait until 2.6, unless
it were considered a feature addition rather than bugfix. 
One would have to wait on a response from Martin or Anthony
to know which it was, though I couldn't say for sure if
operations that are generally performance enhancing are
bugfixes or feature additions.