Expose some more internal types

[adriangb]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.41%. Comparing base (7cecdd1) to head (89b3c57).

Files with missing lines	Patch %	Lines
src/common_union.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   82.62%   82.41%   -0.21%     
==========================================
  Files          15       15              
  Lines        1180     1183       +3     
  Branches     1180     1183       +3     
==========================================
  Hits          975      975              
- Misses        144      147       +3     
  Partials       61       61              

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