[italics] Work around RoboFab-related issues

This is (hopefully) a temporary hack until a more robust solution to
the issue is found.

Basically the problem is that RoboFab pens do float-to-float
comparisons to decide whether to remove duplicate points from
contours, and breaks with BooleanOperations output (which can include
point coordinates with very small fractional components). The
italicizing code assumes certain behavior from RoboFab pens and can't
handle duplicate points being kept.

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