Just as a quick follow up, this was
(A) a unicode bug related to parsing
(B) a problem with the copy module in certain modes.
Normally we wouldn't have done a dot release here, but it made sense because we wanted to restore everything to as close-to-perfect after the previous security release series where developing on an embargoed branch and at some speed is always a bit of a tricky thing :)
Should be much better now, and unicode tests are greatly enhanced in integration test land to avoid this in the future.
Thanks for barring with us!