Improve smallint convertors: use macros, add tests

[dr-orlovsky]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: aa3a5901-eade-4501-bafa-6df53cebfb71

📥 Commits

Reviewing files that changed from the base of the PR and between 872842c and 31925bf.

📒 Files selected for processing (1)

• num/src/smallint.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch v0.5

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.5%. Comparing base (872842c) to head (31925bf).

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #31     +/-   ##
========================================
+ Coverage    87.6%   90.5%   +2.9%     
========================================
  Files           8       8             
  Lines        4257    4533    +276     
========================================
+ Hits         3730    4103    +373     
+ Misses        527     430     -97     

Flag	Coverage Δ
rust	90.5% <100.0%> (+2.9%)	⬆️

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