Use int32 to support larger trees

[ms609]

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[codecov]

Codecov Report

❌ Patch coverage is 96.22642% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.45%. Comparing base (62c3274) to head (33d7afc).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/information.h	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #173      +/-   ##
==========================================
- Coverage   97.51%   97.45%   -0.06%     
==========================================
  Files          44       44              
  Lines        3260     3266       +6     
==========================================
+ Hits         3179     3183       +4     
- Misses         81       83       +2     

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