callAPI action: send integer types?

Struggling with an API call atm: Is it possible that the callAPI action converts all numbers into floats when converting the data object to JSON, no matter what? Does anyone know how to work around this behavior? If I could prevent the automatic JSON conversion of the data object and do the conversion myself, that would be helpful.
This is causing issues with an API endpoint expecting integers to the point where I'm not able to use the API.