handle type coercion in fcoalesce

[ben-schwen]

Closes #7545

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.03%. Comparing base (7c410cd) to head (c46c8cf).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7667   +/-   ##
=======================================
  Coverage   99.03%   99.03%           
=======================================
  Files          87       87           
  Lines       16930    16943   +13     
=======================================
+ Hits        16767    16780   +13     
  Misses        163      163           

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[github-actions]

• HEAD=fcoalesce_types slower P<0.001 for memrecycle regression fixed in #5463
  

Generated via commit c46c8cf

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	5 minutes and 21 seconds
Installing different package versions	11 minutes and 11 seconds
Running and plotting the test cases	3 minutes and 57 seconds