Types of changes

• Docs change / refactoring / dependency upgrade
• [ X] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Motivation and context / Related issue

Problem INFEASIBLE cast where it should not happen.

Fixes #126

Fixes #93

How has this been tested (if it applies)

The minimal code to repdroduce the bug is now working.
A user tested on its own data and now the problem is also working

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document.
• All tests passed, and additional code has been covered with new tests.