fix: object results should have attribute values casted as well

[cyjake]

class Post {
  @Column(DataTypes.JSONB)
  extra: Record<string, unknown>
}

const [post] = await Post.select('extra', "JSON_EXTRACT(extra, '$.foo') AS foo");
console.log(typeof post.extra); // expected "object", actually got "string"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.77%. Comparing base (df1d77a) to head (0cb9588).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #433      +/-   ##
==========================================
- Coverage   96.79%   96.77%   -0.03%     
==========================================
  Files          45       45              
  Lines        3716     3718       +2     
  Branches       72       72              
==========================================
+ Hits         3597     3598       +1     
- Misses        105      106       +1     
  Partials       14       14              

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