Minor changes to iterators

[robomics]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 70.21277% with 14 lines in your changes missing coverage. Please review.

Project coverage is 74.39%. Comparing base (365f138) to head (e27022c).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
..._table/include/hictk/impl/bin_table_fixed_impl.hpp	46.66%	3 Missing and 5 partials ⚠️
...nclude/hictk/cooler/impl/dataset_iterator_impl.hpp	71.42%	0 Missing and 4 partials ⚠️
...ble/include/hictk/impl/bin_table_variable_impl.hpp	81.81%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
- Coverage   74.52%   74.39%   -0.13%     
==========================================
  Files         144      144              
  Lines       12434    12459      +25     
  Branches     1445     1449       +4     
==========================================
+ Hits         9266     9269       +3     
- Misses       1989     1998       +9     
- Partials     1179     1192      +13     

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