Matthias Als

@aphi It did work, thanks. I now use it as a temporary workaround. For anyone experiencing this issue, you can use following snippet: ``` values = list(solution.col_value) values[icol] ``` However,...

Hi @whisust, thanks for the contribution. Please update to match newest version on master and resolve conflicts, then we can proceed with a review

I think rather than trying to patch this, we should throw a proper exception because tuples as keys in dictionaries is not json serializable. @george-zubrienko wdyt?