outlined the INTEGER function for performance (+ cleanup)

[badasahog]

Hopefully no conflicts?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.77%. Comparing base (d875823) to head (c490a4e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7232   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files          81       81           
  Lines       15241    15243    +2     
=======================================
+ Hits        15055    15057    +2     
  Misses        186      186           

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[github-actions]

• HEAD=IntegerOutline stopped early for DT[by,verbose=TRUE] improved in #6296
  

Generated via commit c490a4e

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

Task	Duration
R setup and installing dependencies	5 minutes and 0 seconds
Installing different package versions	9 minutes and 58 seconds
Running and plotting the test cases	2 minutes and 36 seconds

[tdhock]

great thanks

[aitap]

Minor style note: since PROTECT() returns its argument, feel free to use the <type> <name> = PROTECT(<expression>) idiom when PROTECT(<name> = <expression>) is not applicable.