Inkscape is missing there, and it scores perfectly, no precision loss.
The only discrepancy (apart from the XML formatting), is the addition of an ID to each object, if missing
If you're comfortable with outline view, that is a good way of speeding things up. However, for drawing it's a lot easier to rely on a raster sketch and then to trace the result in Inkscape either with the fill bucket or using the technical drawing and tweak tools. As of right now my experiences suggest that it's in a state where direct content creation can be really awkward, but it's very good for tracing and finishing images.