Fix async passthrough

[codecov-commenter]

Codecov Report

Base: 98.28% // Head: 98.27% // Decreases project coverage by -0.00% :warning:

Coverage data is based on head (0ac77f1) compared to base (0ceb4d6). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7 +/- ## ========================================== - Coverage 98.28% 98.27% -0.01% ========================================== Files 3 3 Lines 349 348 -1 ========================================== - Hits 343 342 -1 Misses 6 6 ``` | [Impacted Files](https://codecov.io/gh/Tinche/incant/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tin+Tvrtkovi%C4%87) | Coverage Δ | | |---|---|---| | [src/incant/\_\_init\_\_.py](https://codecov.io/gh/Tinche/incant/pull/7/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tin+Tvrtkovi%C4%87#diff-c3JjL2luY2FudC9fX2luaXRfXy5weQ==) | `98.34% <100.00%> (ø)` | | | [src/incant/\_codegen.py](https://codecov.io/gh/Tinche/incant/pull/7/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tin+Tvrtkovi%C4%87#diff-c3JjL2luY2FudC9fY29kZWdlbi5weQ==) | `97.95% <0.00%> (-0.02%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tin+Tvrtkovi%C4%87). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tin+Tvrtkovi%C4%87)

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