Test & fix primitive types

[dr-orlovsky]

Closes #32

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (b524cfc) 55.6% compared to head (75c5fae) 56.6%.

❗ Current head 75c5fae differs from pull request most recent head 54b717b. Consider uploading reports for the commit 54b717b to get more accurate results

Files	Patch %	Lines
rust/src/primitives.rs	90.5%	6 Missing ⚠️
rust/src/embedded.rs	20.0%	4 Missing ⚠️
rust/src/stl.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #33     +/-   ##
========================================
+ Coverage    55.6%   56.6%   +1.0%     
========================================
  Files          23      23             
  Lines        2748    2802     +54     
========================================
+ Hits         1527    1585     +58     
+ Misses       1221    1217      -4     

Flag	Coverage Δ
rust	56.6% <84.1%> (+1.0%)	⬆️

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