Fix integrable type

Zebedee Nichollsrequested to merge
fix-integrable-type into main

Description

Fixes up the type of integrables so that they are more clearly defined.

Checklist

Please confirm that this pull request has done the following:

  • Tests added (N/A)
  • Documentation added (where applicable) (N/A)
  • Changelog item added to changelog/
Edited by Zebedee Nicholls

Merge request reports