Improve floating point conversions

[mborland]

Closes: #432

[codecov]

Codecov Report

❌ Patch coverage is 86.25000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.89%. Comparing base (3382905) to head (216bdb7).
⚠️ Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
test/github_issue_432.cpp	81.66%	0 Missing and 11 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #458      +/-   ##
===========================================
- Coverage    95.99%   95.89%   -0.11%     
===========================================
  Files           83       85       +2     
  Lines         7323     7397      +74     
  Branches      2595     2625      +30     
===========================================
+ Hits          7030     7093      +63     
  Misses          54       54              
- Partials       239      250      +11     

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