58 fixing metric coerce

[shajoezhu]

close #58

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.27%. Comparing base (c4d4e59) to head (d1ec704).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   31.31%   39.27%   +7.95%     
==========================================
  Files          36       36              
  Lines        1587     1604      +17     
==========================================
+ Hits          497      630     +133     
+ Misses       1090      974     -116     

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[llrs-roche]

Nice solution, just one comment.

I like the second test where it uses a repo to really test that it works in practice. Thanks!

[llrs-roche]

The expectations don't explicitly state the class expected. I think it would be better if it used expect_type()