Continued coverage improvements

[mborland]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.3%. Comparing base (fa89c54) to head (c293809).
⚠️ Report is 7 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1080     +/-   ##
=========================================
+ Coverage     99.3%   99.3%   +0.1%     
=========================================
  Files          244     244             
  Lines        16735   16731      -4     
  Branches      1811    1810      -1     
=========================================
+ Hits         16608   16612      +4     
+ Misses         127     119      -8     

Files with missing lines	Coverage Δ
include/boost/decimal/detail/cmath/tgamma.hpp	100.0% <ø> (+10.4%)	⬆️
include/boost/decimal/detail/fenv_rounding.hpp	98.2% <100.0%> (ø)
include/boost/decimal/dpd_conversion.hpp	96.9% <ø> (+0.3%)	⬆️
test/test_assoc_legendre.cpp	100.0% <100.0%> (ø)
test/test_cmath.cpp	100.0% <100.0%> (ø)

... and 5 files with indirect coverage changes

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