Clean up/speed up numpy array construction

[codecov[bot]]

Codecov Report

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

Comparison is base (dde5a73) 95.62% compared to head (244dac9) 95.71%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #36 +/- ## ========================================== + Coverage 95.62% 95.71% +0.09% ========================================== Files 17 17 Lines 891 910 +19 ========================================== + Hits 852 871 +19 Misses 39 39 ```

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