Faster sortexp

[sostock]

Cherry-picked from #569.

[codecov-commenter]

Codecov Report

Merging #575 (78f0bba) into master (ebad449) will decrease coverage by 3.21%.
The diff coverage is 100.00%.

❗ Current head 78f0bba differs from pull request most recent head be808dc. Consider uploading reports for the commit be808dc to get more accurate results

@@            Coverage Diff             @@
##           master     #575      +/-   ##
==========================================
- Coverage   87.92%   84.71%   -3.22%     
==========================================
  Files          16       16              
  Lines        1449     1452       +3     
==========================================
- Hits         1274     1230      -44     
- Misses        175      222      +47     

Impacted Files	Coverage Δ
src/user.jl	95.78% <ø> (+0.52%)	⬆️
src/display.jl	95.95% <100.00%> (+0.04%)	⬆️
src/range.jl	92.94% <100.00%> (+1.37%)	⬆️
src/promotion.jl	42.22% <0.00%> (-53.34%)	⬇️
src/logarithm.jl	69.67% <0.00%> (-8.61%)	⬇️
src/dimensions.jl	90.47% <0.00%> (-4.77%)	⬇️
src/types.jl	87.75% <0.00%> (-2.05%)	⬇️
src/dates.jl	95.83% <0.00%> (-1.39%)	⬇️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more