Fix reuse_instances for non dataclass objects

[yukinarit]

Closes #483

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.31%. Comparing base (f1c49f2) to head (43dca1d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #486      +/-   ##
==========================================
+ Coverage   89.49%   90.31%   +0.81%     
==========================================
  Files          12       12              
  Lines        1933     1931       -2     
  Branches      401      400       -1     
==========================================
+ Hits         1730     1744      +14     
+ Misses        148      132      -16     
  Partials       55       55              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.