Use Ref(Ref(pair)) to force heap allocation

[tkf]

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[codecov]

Codecov Report

Merging #6 (c45f368) into master (532c7c5) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   79.46%   79.56%   +0.09%     
==========================================
  Files           5        5              
  Lines         599      597       -2     
==========================================
- Hits          476      475       -1     
+ Misses        123      122       -1     

Flag	Coverage Δ
unittests	79.56% <100.00%> (+0.09%)	⬆️

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Impacted Files	Coverage Δ
src/dict.jl	80.04% <100.00%> (+0.04%)	⬆️
src/utils.jl	74.21% <100.00%> (+0.17%)	⬆️

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