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We're a week out from release-candidate, and this seems (to
me) to be an area that's fraught with risk. The terms
"HP/UX" and "threads" have also cropped up, which, for me,
is a marker of "here be sodding great big dragons". 

I don't mind delaying the release if it's necessary, and
there's a definite path to getting a nice clean fix in that
won't break things for some other class of platform. This
stuff looks like being a beast to test for, though.