svg ouptut misses very small features

[DannyYCCheng]

Describe the bug A clear and concise description of what the bug is.

We are using Slic3r for very small prints (with accuracy down to micrometres). We use Slic3r to output a svg file, which is then converted to the format we need. One of the test model has a hole 0.02mm in diameter, when I output this to svg, the holes do not show up. I then scaled the model up 5 times, and all except the 0.02mm (now 0.02*5=0.1mm) holes are visible, the next hole is 0.03mm (scaled up to 0.15mm) so I know holes <=0.1mm aren't visible when outputted to svg, and holes somewhere between 0.1mm to 0.15mm and bigger are visible. The documentation for svg says:

The majority of options in Slic3r are not required when generating SVG, however the Layer height setting will dictate the number of layers. Note that Slic3r restricts the layer height to be smaller than the nozzle diameter, so this may also have to increased if higher layers are desired.

Unsure if there is a setting in Slic3r that I can change to increase the minimum resolution for svg output?

3D model of the original size and upscaled so 5x the original size attached: slic3r_resolution_test.zip

One layer at original size:

One layer at 5x size:

Configuration: config.ini.zip

OS: Linux Version: 1.3.0