[cairo] Arcs appear thicker than straight lines?

[Yifan Yu]

Hi, I'm trying to draw a simple rounded rectangle with four little arcs,
using one of the methods described
here<http://cairographics.org/cookbook/roundedrectangles/>.
The result is fine, with just one problem: the arc lines appear thicker in
line width than the straight lines (estimated as twice as thick, while the
straight lines are thin and sharp). This is especially annoying when the
radius of the arcs is small. Is it possible to make the arc lines as sharp
and thin as the straight lines?

Any hints?
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