Issue/86/data handle subtypes

[eacharles]

Problem & Solution Description (including issue #)

Code Quality

• [ ] My code follows the code style of this project
• [ ] I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• [ ] My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• [ ] Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (99b6695) 97.20% compared to head (8c54b1d) 97.22%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #87 +/- ## ========================================== + Coverage 97.20% 97.22% +0.01% ========================================== Files 32 32 Lines 1755 1765 +10 ========================================== + Hits 1706 1716 +10 Misses 49 49 ```

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