Fix type inference issue in basket access

[tamasgal]

This PR separates the index calculation of normal baskets and recovered ones in two separate functions. The fix however for #242 comes from the fact that now the return types are defined to be a UnitRange{Int} for both of them.

I did not manage to write a test to check the correct type inference yet.

[codecov]

Codecov Report

Patch coverage: 62.50% and project coverage change: -0.04 ⚠️

Comparison is base (db2b306) 87.53% compared to head (25f7a87) 87.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #243      +/-   ##
==========================================
- Coverage   87.53%   87.50%   -0.04%     
==========================================
  Files          18       18              
  Lines        2279     2281       +2     
==========================================
+ Hits         1995     1996       +1     
- Misses        284      285       +1     

Impacted Files	Coverage Δ
src/iteration.jl	85.23% <62.50%> (-0.30%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[tamasgal]

I opened an issue to remind (myself) of type stability tests: #244