DXF files may contain hints about their measurement units, or they may
be abstract numbers. dxf2code tries to guess but if it finds no
information either way, it defaults to mm.
Some files contain numbers in inches (e.g. in my case, the dxf resultant
output from https://cloudconvert.com/svg-to-dxf). Loading these into
dxf2code results in shapes that are too small. While this can be
corrected by applying a "Scale All" factor of 25.4, it would be nicer if
the units could be specified; e.g.
$ dxf2code --inches output.dxf