fix: set name and length properties to op2 object methods

[petamoriken]

fix #1162

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.82%. Comparing base (0c7f83e) to head (da512b0).
⚠️ Report is 334 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1188      +/-   ##
==========================================
- Coverage   81.43%   79.82%   -1.61%     
==========================================
  Files          97      100       +3     
  Lines       23877    25880    +2003     
==========================================
+ Hits        19445    20660    +1215     
- Misses       4432     5220     +788     

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[littledivy]

LGTM