[FIX] oweditdomain: Use variable repr for continuous to discrete transform

[ales-erjavec]

Issue

Fixes #7299

Description of changes

• Use variable repr for continuous to discrete transform

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.98%. Comparing base (3d4ddaa) to head (7c74396).
⚠️ Report is 23 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7301      +/-   ##
==========================================
- Coverage   89.04%   88.98%   -0.06%     
==========================================
  Files         336      336              
  Lines       74426    74544     +118     
==========================================
+ Hits        66269    66331      +62     
- Misses       8157     8213      +56     

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