Update the `vtrwrite` and `vtswrite` functions

[codecov[bot]]

Codecov Report

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

Comparison is base (da9505f) 92.34% compared to head (92ccd07) 92.40%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #29 +/- ## ========================================== + Coverage 92.34% 92.40% +0.05% ========================================== Files 10 10 Lines 405 408 +3 ========================================== + Hits 374 377 +3 Misses 31 31 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.