Comment 3 for bug 437929

1) numeric precision preferences

~/.inkscape/preferences.xml (0.46):
   <group
       id="svgoutput"
       usenamedcolors="0"
       numericprecision="8"
       minimumexponent="-8"
       inlineattrs="0"
       indent="2" />
    <group

If 'numericprecision' is set to 1 or 2 current prerelease builds crash on start-up due to bug #399604. Until there is a real fix for it, numeric precision preferences from 0.46 would need to be filtered and set to >= 3 (default: 8) if migrated to 0.47.
0.46 doesn't have a GUI option for these SVG output preferences but they can be changed by editing the xml file manually.

2) 0.46+devel no longer stores the version number in the preferences file. Any reason not to?

~/.inkscape/preferences.xml (0.46):
<inkscape
   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
   version="0.46">

~/.config/inkscape/preferences.xml (0.46+devel):
<inkscape
   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
   version="1">