Why is this package stripping content out of the request body?

[braco]

I threw some console.logs into your fetch package after tearing my hair out over acf fields not making it through the request.

Code:

api.customType().create({
          title: { raw },
          content: {  raw },
          acf: { field1, field2 },
          foo: 'bar',
});

Actual fetch:

{
  url: 'wp/v2/customType',
  body: '{ "title":"...", "content":"...", "foo":"bar" }',
  method: 'post'
}

What could be the reason for this?

https://github.com/dkress59/wordpress-api-client/blob/55887526a7c0965b134608e37ce00406065a755a/src/util.ts#L98

Additionally, it was difficult to figure out what the create() JSON format was supposed to look like (not title:"" but title:{raw}), as there are no full examples in the docs.