better match base::order(method=) and decreasing=

[MichaelChirico]

Closes #4456

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.62%. Comparing base (a599557) to head (63fce19).
Report is 14 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6655   +/-   ##
=======================================
  Coverage   98.61%   98.62%           
=======================================
  Files          79       79           
  Lines       14559    14567    +8     
=======================================
+ Hits        14358    14366    +8     
  Misses        201      201           

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[github-actions]

Generated via commit 63fce19

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

Task	Duration
R setup and installing dependencies	4 minutes and 37 seconds
Installing different package versions	7 minutes and 30 seconds
Running and plotting the test cases	2 minutes and 14 seconds

[MichaelChirico]

Somehow I'd missed #4458. This PR is narrower, so I suggest merging it independently.

[tdhock]

lgtm