refactor(csv): throw errors immediately

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.81%. Comparing base (29f5612) to head (2649d2d).

Files	Patch %	Lines
csv/_io.ts	75.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5299 +/- ## ======================================= Coverage 95.80% 95.81% ======================================= Files 457 457 Lines 37955 37907 -48 Branches 5572 5568 -4 ======================================= - Hits 36364 36321 -43 + Misses 1551 1546 -5 Partials 40 40 ```

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