Fix value comparisons

[Stranger6667]

Fixes #149

[codecov]

Codecov Report

Merging #152 (fdf47c2) into master (3ab7658) will increase coverage by 0.18%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
+ Coverage   71.76%   71.95%   +0.18%     
==========================================
  Files          51       51              
  Lines        3450     3480      +30     
==========================================
+ Hits         2476     2504      +28     
- Misses        974      976       +2     

Impacted Files	Coverage Δ
src/lib.rs	18.75% <ø> (ø)
src/keywords/const_.rs	66.07% <50.00%> (ø)
src/keywords/helpers.rs	90.47% <88.23%> (-9.53%)	⬇️
src/keywords/enum_.rs	60.00% <100.00%> (ø)
src/keywords/mod.rs	98.44% <100.00%> (+0.12%)	⬆️

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