Fixes for proper handling of IEEE Section 7.2

[mborland]

Closes: #1107

[codecov]

Codecov Report

❌ Patch coverage is 95.61404% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.4%. Comparing base (ca6ef19) to head (7a30129).
⚠️ Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
include/boost/decimal/decimal_fast128_t.hpp	66.7%	8 Missing ⚠️
include/boost/decimal/decimal64_t.hpp	96.7%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1136     +/-   ##
=========================================
- Coverage     99.4%   99.4%   -0.0%     
=========================================
  Files          251     252      +1     
  Lines        17023   17164    +141     
  Branches      1834    1866     +32     
=========================================
+ Hits         16918   17048    +130     
- Misses         105     116     +11     

Files with missing lines	Coverage Δ
include/boost/decimal/decimal128_t.hpp	98.6% <100.0%> (+0.1%)	⬆️
include/boost/decimal/decimal32_t.hpp	96.8% <100.0%> (+0.1%)	⬆️
include/boost/decimal/decimal_fast32_t.hpp	100.0% <100.0%> (ø)
include/boost/decimal/decimal_fast64_t.hpp	100.0% <100.0%> (ø)
include/boost/decimal/detail/comparison.hpp	99.5% <100.0%> (+0.1%)	⬆️
test/compare_dec128_and_fast.cpp	97.7% <100.0%> (-2.3%)	⬇️
test/github_issue_1106.cpp	100.0% <ø> (ø)
test/github_issue_1107.cpp	100.0% <100.0%> (ø)
test/random_decimal64_math.cpp	100.0% <ø> (ø)
test/random_mixed_decimal_math.cpp	100.0% <ø> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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