Twaek the iteration interface, allow recursive branch search

[tamasgal]

Closes #197

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.47%. Comparing base (cd56b58) to head (26a0a19).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/iteration.jl	83.33%	1 Missing ⚠️
src/root.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #411      +/-   ##
==========================================
- Coverage   86.51%   86.47%   -0.04%     
==========================================
  Files          24       24              
  Lines        3360     3365       +5     
==========================================
+ Hits         2907     2910       +3     
- Misses        453      455       +2     

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