add sortperm

[codecov[bot]]

Codecov Report

Merging #105 (8564278) into master (024daeb) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   77.11%   77.13%   +0.02%     
==========================================
  Files          18       18              
  Lines        2001     2003       +2     
==========================================
+ Hits         1543     1545       +2     
  Misses        458      458              

Impacted Files	Coverage Δ
src/Dictionary.jl	80.00% <100.00%> (+0.10%)	:arrow_up:
src/Indices.jl	88.28% <100.00%> (+0.03%)	:arrow_up:

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[andyferris]

I got excited: https://github.com/JuliaRegistries/General/pull/65366

[aplavin]

Great! I think this is quite efficient for Indices, less so for Dictionaries: it sorts the whole dict and then only takes its indices. But sortperm is generally pretty slow in Julia, unfortunately, so it shouldn't make that much of a difference.

[andyferris]

Yeah, exactly