[WIP] Fix dtype handling verification

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>dtype handling</issue_title>
<issue_description>honestly i think we're fine, but i love verifying my intuition</issue_description>

<agent_instructions>be surgical and minimal
prioritize clarity
sometimes, one great test is enough</agent_instructions>

Comments on the Issue (you are @copilot in this section)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.83%. Comparing base (2f6d320) to head (ecb10c2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   94.83%   94.83%           
=======================================
  Files          11       11           
  Lines        1336     1336           
=======================================
  Hits         1267     1267           
  Misses         69       69           

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