Floating Point Parsing Fix

[vincentlaucsb]

Fixed/added tests for the parsing of subunit floating point values as reported by #15

[codecov]

Codecov Report

Merging #16 into master will decrease coverage by 0.03%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage    96.3%   96.26%   -0.04%     
==========================================
  Files           7        7              
  Lines         568      563       -5     
==========================================
- Hits          547      542       -5     
  Misses         21       21

Impacted Files	Coverage Δ
src/data_type.cpp	82.22% <80%> (-1.78%)	⬇️

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