simplify ind method

[DirkEilander]

Issue addressed

Simplify calculating a mask from indices

Explanation

Explain how you addressed the bug/feature request, what choices you made and why.

Checklist

• Updated tests or added new tests
• Branch is up to date with main
• Updated documentation if needed
• Updated changelog.rst if needed

Additional Notes (optional)

Add any additional notes or information that may be helpful.

[roeldegoede]

Looks good, nice work on the test as well!

Two things I noticed;

• this branch is not up-to-date with main (better to always pull from main first right?)
• we never changed the version to 1.0.4.dev (maybe good to still to this within this very simple PR)

[DirkEilander]

Thanks for the review. I just updated the branch and bumped the version number.