fix: make the dimension a PositiveInt for typing

[AbeCoull]

Issue #, if available:

Description of changes:

Testing done:

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[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (c4779db) to head (4777734).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #226 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 48 48 Lines 3744 3745 +1 Branches 910 910 ========================================= + Hits 3744 3745 +1 ```

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