Allow explicit setting range index

[Magnus167]

Required by #47

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.

Project coverage is 98.17%. Comparing base (7b33b5b) to head (453e34e).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/frame/base.rs	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   98.23%   98.17%   -0.06%     
==========================================
  Files           7        7              
  Lines        4870     4878       +8     
==========================================
+ Hits         4784     4789       +5     
- Misses         86       89       +3     

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