Fix for 777

[mborland]

Closes: #777

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.7%. Comparing base (d470174) to head (8fe3c09).
Report is 16 commits behind head on develop.

Files with missing lines	Patch %	Lines
include/boost/decimal/charconv.hpp	75.0%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #778     +/-   ##
=========================================
- Coverage     98.7%   98.7%   -0.0%     
=========================================
  Files          223     223             
  Lines        16742   16744      +2     
  Branches      1798    1799      +1     
=========================================
  Hits         16517   16517             
- Misses         225     227      +2     

Files with missing lines	Coverage Δ
test/test_to_chars.cpp	100.0% <ø> (ø)
include/boost/decimal/charconv.hpp	79.6% <75.0%> (-0.1%)	⬇️

... and 1 file with indirect coverage changes

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