Fix handling of extreme size literals

[mborland]

Closes: #1119

[cppalliance-bot]

An automated preview of the documentation is available at https://1122.decimal.prtest3.cppalliance.org/libs/decimal/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2025-10-13 10:20:51 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.4%. Comparing base (4d0c7e2) to head (cf5ffa5).
⚠️ Report is 12 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1122     +/-   ##
=========================================
+ Coverage     99.4%   99.4%   +0.1%     
=========================================
  Files          246     246             
  Lines        16778   16794     +16     
  Branches      1812    1812             
=========================================
+ Hits         16671   16689     +18     
+ Misses         107     105      -2     

Files with missing lines	Coverage Δ
include/boost/decimal/literals.hpp	100.0% <ø> (ø)
test/test_literals.cpp	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

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