Refactor / simplify DataStub.export method

[ehennestad]

Motivation

• Add comment providing context why a compound dataset with references needs to be loaded into memory when written to a new file
• Reuse io.parseCompound to reduce code duplication and ensure processing of compound is standardised (the current version would not properly copy over boolean values contained in a compound dataset)
• Update unittest for export/copy of DataStub with compound dataset to include a boolean data value, verifying that compound with references + booleans are correctly copied.

How to test the behavior?

Show here how to reproduce the new behavior (can be a bug fix or a new feature)

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.58%. Comparing base (7cdde97) to head (9673c1e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #767      +/-   ##
==========================================
+ Coverage   95.56%   95.58%   +0.01%     
==========================================
  Files         182      182              
  Lines        6386     6366      -20     
==========================================
- Hits         6103     6085      -18     
+ Misses        283      281       -2     

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[Copilot]

Pull Request Overview

This PR refactors the DataStub export functionality to simplify compound data type handling with references by delegating postprocessing to a centralized function. The key improvement is reducing code duplication and ensuring consistent data type handling across the codebase.

• Extracts reference checking logic into a helper function isCompoundWithReference
• Replaces manual reference/character array processing with a call to io.parseCompound for consistency
• Updates tests and schema to include a boolean field in compound types for better test coverage

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
+types/+untyped/@DataStub/export.m	Refactored to extract reference checking logic and delegate compound data postprocessing to io.parseCompound
+tests/test-schema/compoundSchema/cs.compoundtypes.yaml	Added boolean field 'c' to compound type schema for test coverage
+tests/+unit/dataStubTest.m	Updated tests to include boolean field in compound data and improved test structure with renamed variables

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