[cairo] Path length

[Stuart Axon]

Is the best way to get the length of a cairo path to call cairo_copy_path_flat and sum the lengths of the LINE_TOs contained inside ?
I've been looking at arc lengths and it seems it can get complex, any chance of cairo providing cairo_path_length in future, or should I be looking at something like 2geom for this sort of thing ?
 S++
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