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IMO, it was my fault.  I reviewed, tested and applied the patch.

Also, I don't think optimization evils have much to do with
it.  It was an oversight that could affect any patch. 
Fortunately, a good beta process helped catch it quickly.

There may even be a silver lining.  By invalidating the
cache in the resize call, we may have fixed other possibly
broken code and will have prevented other errors in the future.