However, @ChrisJefferson wasn't consciously thinking about digraphs with multiple edges when he implemented this stuff. So it's possibly that it's only coincidentally working for the cases that I've tried, and that it will not work properly in some cases.
We should look at the code and convince ourselves that it does 'the right thing' in all cases.
Superficially, it seems that Vole is properly taking multidigraphs into account:
However, @ChrisJefferson wasn't consciously thinking about digraphs with multiple edges when he implemented this stuff. So it's possibly that it's only coincidentally working for the cases that I've tried, and that it will not work properly in some cases.
We should look at the code and convince ourselves that it does 'the right thing' in all cases.