Keep pillar attribute in vec_restore()

[krlmlr]

Required for vec_slice(). Follow-up to #275.

[codecov]

Codecov Report

Merging #280 (541d2d1) into master (e215530) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 541d2d1 differs from pull request most recent head e0b7058. Consider uploading reports for the commit e0b7058 to get more accurate results

@@           Coverage Diff           @@
##           master     #280   +/-   ##
=======================================
  Coverage   94.41%   94.41%           
=======================================
  Files          18       18           
  Lines         877      877           
=======================================
  Hits          828      828           
  Misses         49       49           

Impacted Files	Coverage Δ
R/make_units.R	89.83% <ø> (-0.26%)	⬇️
R/tidyverse.R	96.77% <100.00%> (+0.34%)	⬆️

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[krlmlr]

macOS devel doesn't have binaries for udunits2, otherwise builds look good.

[krlmlr]

See https://pillar.r-lib.org/dev/articles/numbers.html#units for a demo, I quite like it! We can set display options on a units object, it survives arithmetics.

[Enchufa2]

Could you please rebase/merge current master? I've added a workflow to check quantities on PR.

[Enchufa2]

All good, thanks!