Fix performance issue by not eagerly expanding type args in 'expandScheme'

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.00%. Comparing base (5ce4b35) to head (830b140).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #256 +/- ## ========================================== + Coverage 83.44% 84.00% +0.56% ========================================== Files 24 24 Lines 10515 10506 -9 Branches 1492 1490 -2 ========================================== + Hits 8774 8826 +52 + Misses 1741 1680 -61 ```

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