fix: derive send function type from machine

[Flammae]

fixes: #250

[changeset-bot]

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Latest commit: 09a645c

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[matthewp]

Thank you! Can you create a changeset? npm run changeset. This would be a patch change.

[PatSmuk]

@Flammae @matthewp Would either of you be able to move this forward?

[matthewp]

Yeah happy to