Update division operation behavior and docs

[mborland]

Traps like the builtins, because throwing would make it so that we can't vectorize.

[cppalliance-bot]

An automated preview of the documentation is available at https://451.int128.prtest3.cppalliance.org/libs/int128/doc/html/index.html

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

2026-07-23 19:40:13 UTC

[codecov]

Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.08%. Comparing base (420dec9) to head (b104725).
⚠️ Report is 19 commits behind head on develop.

Files with missing lines	Patch %	Lines
include/boost/int128/detail/int128_imp.hpp	0.00%	8 Missing ⚠️
include/boost/int128/detail/uint128_imp.hpp	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #451      +/-   ##
===========================================
- Coverage    96.28%   96.08%   -0.20%     
===========================================
  Files           83       83              
  Lines         7268     7260       -8     
  Branches      2560     2552       -8     
===========================================
- Hits          6998     6976      -22     
- Misses          31       45      +14     
  Partials       239      239              

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