COMPAT: relax string vs object dtype check

[martinfleis]

Closes #284

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.8%. Comparing base (53e050b) to head (5862663).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #285     +/-   ##
=======================================
- Coverage   99.1%   98.8%   -0.2%     
=======================================
  Files          7       7             
  Lines       1274    1274             
=======================================
- Hits        1262    1259      -3     
- Misses        12      15      +3     

see 1 file with indirect coverage changes

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[jGaboardi]

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