UniqTransformer feature

[evgeniy-r]

Issue #8

There are some questions in source comments.

✓ Checklist:

• This PR has been added to CHANGELOG.md (at the top of the list);
• Tests for the changes have been added (for bug fixes / features);
• Docs have been added / updated (for bug fixes / features).

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (main@393573d). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #16   +/-   ##
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  Coverage        ?   40.26%           
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  Files           ?       35           
  Lines           ?     1150           
  Branches        ?        0           
=======================================
  Hits            ?      463           
  Misses          ?      687           
  Partials        ?        0           

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