Backport deparse1()

[MichaelChirico]

Eventually, when depending on R 4.0.0, we can drop this and just rely on the {base} export.

[github-actions]

No obvious timing issues in HEAD=deparse

Generated via commit 48b5cd4

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

Task	Duration
R setup and installing dependencies	2 minutes and 58 seconds
Installing different package versions	23 seconds
Running and plotting the test cases	5 minutes and 33 seconds

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.01%. Comparing base (94649d5) to head (48b5cd4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7823   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files          88       88           
  Lines       17234    17234           
=======================================
  Hits        17065    17065           
  Misses        169      169           

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[ben-schwen]

LGTM TY