Improve inference quality (and fix a bug)

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #27 (152df6d) into master (bc333b6) will decrease coverage by 2.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
- Coverage   80.75%   78.40%   -2.35%     
==========================================
  Files           5        5              
  Lines         291      264      -27     
==========================================
- Hits          235      207      -28     
- Misses         56       57       +1     

Flag	Coverage Δ
unittests	78.40% <100.00%> (-2.35%)	⬇️

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Impacted Files	Coverage Δ
src/reduce.jl	88.00% <100.00%> (-0.75%)	⬇️
src/testing.jl	87.62% <0.00%> (-2.73%)	⬇️
src/utils.jl	40.54% <0.00%> (-1.57%)	⬇️
src/collect.jl	85.41% <0.00%> (-1.13%)	⬇️

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