Explain why this is different from Boost.MP

[mborland]

Closes: #385

[cppalliance-bot]

An automated preview of the documentation is available at https://387.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.

2026-04-28 21:14:20 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.89%. Comparing base (823c8bd) to head (5fdae75).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #387   +/-   ##
========================================
  Coverage    98.89%   98.89%           
========================================
  Files           67       67           
  Lines         5636     5636           
  Branches      1788     1788           
========================================
  Hits          5574     5574           
  Misses          31       31           
  Partials        31       31           

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