Prune some low hanging charconv optimization branches

[mborland]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.

Project coverage is 98.8%. Comparing base (b29748c) to head (c0cedef).
Report is 9 commits behind head on develop.

Files with missing lines	Patch %	Lines
include/boost/decimal/charconv.hpp	92.9%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #874     +/-   ##
=========================================
- Coverage     98.9%   98.8%   -0.0%     
=========================================
  Files          233     233             
  Lines        16784   16786      +2     
  Branches      1800    1798      -2     
=========================================
  Hits         16584   16584             
- Misses         200     202      +2     

Files with missing lines	Coverage Δ
test/test_to_chars.cpp	100.0% <ø> (ø)
include/boost/decimal/charconv.hpp	87.8% <92.9%> (-0.6%)	⬇️

... and 2 files with indirect coverage changes

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