Merge to Master for v3.0.0

[mborland]

Breaking change is that our behavior now matches builtins without opinion.

[cppalliance-bot]

An automated preview of the documentation is available at https://412.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.

2026-06-03 17:48:56 UTC

[mborland]

Hi, @sdarwin, can you see why the doc preview is 404ing? I didn't change any of the Antora yaml files, the only things with any diffs in the infrastructure are the package.json and package-lock.json. Thanks.

[codecov]

Codecov Report

❌ Patch coverage is 89.11043% with 213 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.19%. Comparing base (823c8bd) to head (fb37592).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
test/test_builtin_parity.cpp	29.72%	0 Missing and 130 partials ⚠️
test/test_mixed_type_sign_compare.cpp	25.00%	0 Missing and 24 partials ⚠️
test/test_ckd.cpp	93.05%	7 Missing and 11 partials ⚠️
test/test_div_primitives.cpp	86.08%	2 Missing and 14 partials ⚠️
test/test_mixed_type_sign_conversion.cpp	22.22%	2 Missing and 12 partials ⚠️
include/boost/int128/detail/common_div.hpp	95.45%	3 Missing and 2 partials ⚠️
examples/checked_arithmetic.cpp	93.54%	0 Missing and 2 partials ⚠️
test/test_cross_type_assign.cpp	98.51%	0 Missing and 2 partials ⚠️
test/test_x64_msvc_div.cpp	95.34%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
- Coverage   98.89%   96.19%   -2.71%     
==========================================
  Files          67       79      +12     
  Lines        5636     7068    +1432     
  Branches     1788     2450     +662     
==========================================
+ Hits         5574     6799    +1225     
- Misses         31       34       +3     
- Partials       31      235     +204     

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[sdarwin]

Hi, @sdarwin, can you see why the doc preview is 404ing? I didn't change any of the Antora yaml files, the only things with any diffs in the infrastructure are the package.json and package-lock.json. Thanks.

I have been investigating, and still can't discover the cause.

However this is an unusual pull request. Almost all PRs are from another branch into develop. This is develop to master. The result should be the same as develop docs: https://develop.int128.cpp.al/overview.html

Perhaps just proceed, and report back if ordinary pull requests, to develop, start to have a problem.