io: use reshape instead of ravel to avoid copy

[codecov[bot]]

Codecov Report

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

Project coverage is 84.74%. Comparing base (0226a7d) to head (f7120ca).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #289 +/- ## ========================================== - Coverage 89.35% 84.74% -4.61% ========================================== Files 16 16 Lines 3842 3842 Branches 906 906 ========================================== - Hits 3433 3256 -177 - Misses 283 465 +182 + Partials 126 121 -5 ```

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