fix: handle duplicate keys in TupleSetToDictionaryConverter

[vicfergar]

Fixes #13

[github-actions[bot]]

Unit Test Results

686 tests  +2   686 :heavy_check_mark: +2   9s :stopwatch: ±0s   39 suites ±0       0 :zzz: ±0      3 files   ±0       0 :x: ±0 

Results for commit 267fc5ce. ± Comparison against base commit ae86e8a3.

:recycle: This comment has been updated with latest results.