refactor(conv): change conversion to return iterator

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.75%. Comparing base (7e70549) to head (adebef7).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #490 +/- ## ========================================== + Coverage 86.74% 86.75% +0.01% ========================================== Files 58 58 Lines 13650 13653 +3 ========================================== + Hits 11841 11845 +4 + Misses 1809 1808 -1 ```

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