In the dim dark past a challenge was issued, it lay defiantly unanswered for years, until @devilman3d tried valiantly only to be smitten by CGAL, now @justbuchanan has taken the gauntlet, buy yet again CGAL triumphs, the battlefield lay silent, until @slaviber chose a different attack, so the story continues...

I suspect this will need significant testing & may well require a few iterations. So I propose the pull can be used initially, but this should be used for the longer term.

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