test: re-enable api type tests and fix type assertion

[danielroe]

This reverts commit 1d9102a.

🔗 Linked issue

closes #771

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #772 (efdf196) into main (1d9102a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #772   +/-   ##
=======================================
  Coverage   70.07%   70.07%           
=======================================
  Files          57       57           
  Lines        5209     5209           
  Branches      568      568           
=======================================
  Hits         3650     3650           
  Misses       1550     1550           
  Partials        9        9           

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