check_dtype=False for full fua test

[jGaboardi]

• check_dtype=False for full fua test
• PERF: replace _first_non_null with builtin "first" aggregation #292 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.8%. Comparing base (2d7aa61) to head (e901ae1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #293     +/-   ##
=======================================
- Coverage   99.1%   98.8%   -0.2%     
=======================================
  Files          7       7             
  Lines       1282    1282             
=======================================
- Hits        1270    1267      -3     
- Misses        12      15      +3     

see 1 file with indirect coverage changes

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[jGaboardi]

We are fully green here, so I'll self-merge.