implement alt for dynamic arrays

[Geal]

Fix #1720

[codecov]

Codecov Report

Attention: Patch coverage is 61.53846% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 60.57%. Comparing base (82b09f0) to head (8ee8e8c).
Report is 3 commits behind head on main.

Files	Patch %	Lines
src/branch/mod.rs	61.53%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1754      +/-   ##
==========================================
- Coverage   62.01%   60.57%   -1.45%     
==========================================
  Files          24       24              
  Lines        2917     3282     +365     
==========================================
+ Hits         1809     1988     +179     
- Misses       1108     1294     +186     

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[codspeed-hq]

CodSpeed Performance Report

Merging #1754 will not alter performance

_{Comparing alt-dynamic-array (8ee8e8c) with main (cea6595)}

Summary

✅ 24 untouched benchmarks