fix(diff): handle various types combination in "compare"

[matej21]

No description provided.

[codecov-io]

Codecov Report

Merging #62 into master will increase coverage by 0.29%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   89.89%   90.19%   +0.29%     
==========================================
  Files           3        3              
  Lines         297      306       +9     
==========================================
+ Hits          267      276       +9     
  Misses         30       30              

Impacted Files	Coverage Δ
src/diff.js	99.21% <92.30%> (-0.79%)	⬇️
src/assert.js	92.59% <0.00%> (+1.23%)	⬆️

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