876/vInt

[ijsbol]

Description

Follows on from #1265 regarding #876

Checklist

• I've added a change log entry to CHANGES.rst.
• I've added or updated tests if applicable.
• I've run and ensured all tests pass locally by following Run tests.
• I've added or edited documentation, both as docstrings to be rendered in the API documentation and narrative documentation, as necessary.

[ijsbol]

There are still 20 items left on #876 - should I continue to create individual PRs for each addition, or would you prefer one PR with the additional features? cc @niccokunzmann

[stevepiercy]

@ijsbol one at a time is easier to review and will get merged more quickly.

[stevepiercy]

Thank you!