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My thought is to close the bug, but add a unittest that 
says in effect:  if os is cygwin and version(cygwin) >= 
1.3.13 and the bug still exists, then fail with a message 
saying that SF 556025 was not successfully resolved.

This way, we can close the bug (since it is not a python 
bug) and still get a regression test to raise the concern if 
the expected solution either doesn't materialize or 
sometime later dematerializes.