Add support for floating point and integral compound operators

[mborland]

Closes: #486
Closes: #487
Closes: #489

[cppalliance-bot]

An automated preview of the documentation is available at https://490.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.

2026-07-31 22:55:11 UTC

[codecov]

Codecov Report

❌ Patch coverage is 86.54709% with 90 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.09%. Comparing base (d0668e3) to head (486ba76).
⚠️ Report is 20 commits behind head on develop.

Files with missing lines	Patch %	Lines
test/test_float_mixed_ops.cpp	81.57%	8 Missing and 27 partials ⚠️
test/test_integer_mixed_ops.cpp	85.94%	0 Missing and 26 partials ⚠️
test/test_float_conversion.cpp	83.76%	10 Missing and 15 partials ⚠️
test/github_issue_432.cpp	25.00%	1 Missing and 2 partials ⚠️
examples/mixed_float_arithmetic.cpp	96.77%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #490      +/-   ##
===========================================
- Coverage    95.75%   95.09%   -0.66%     
===========================================
  Files           92       96       +4     
  Lines         8171     8854     +683     
  Branches      3009     3245     +236     
===========================================
+ Hits          7824     8420     +596     
- Misses          61       80      +19     
- Partials       286      354      +68     

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