MSVC added constexpr support to their 128-bit ints

[mborland]

Closes: #383

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.89%. Comparing base (823c8bd) to head (7b629b5).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #386   +/-   ##
========================================
  Coverage    98.89%   98.89%           
========================================
  Files           67       67           
  Lines         5636     5636           
  Branches      1788     1788           
========================================
  Hits          5574     5574           
  Misses          31       31           
  Partials        31       31           

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