various coverage

[mattdowle]

Follow up to PR #3715. Coverage wasn't working at the time.

[codecov]

Codecov Report

Merging #3757 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3757      +/-   ##
==========================================
+ Coverage    98.8%   98.83%   +0.03%     
==========================================
  Files          70       70              
  Lines       13227    13228       +1     
==========================================
+ Hits        13069    13074       +5     
+ Misses        158      154       -4

Impacted Files	Coverage Δ
R/last.R	100% <100%> (+15.38%)	⬆️
R/transpose.R	100% <100%> (+5.4%)	⬆️
R/test.data.table.R	100% <100%> (ø)	⬆️

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