Serialize BuiltMap<String, Object> without internal discriminators

I have an object that holds a BuitMap (data) that contains non nested standard json key values pairs of different types _( int, float, (built)list, string)_.

```
data = {
"foo": "bar",
"baz": 1.2
}.build();
```

The trouble is that if this gets serialized, the results have the **$** discriminator added. _(The data coming from the backend also does not have any discriminators.)_

```{... , "data": {"bar": {"$": "String", : "baz"}, "foo": {"$": "int", : 1}}}```

This doesn't play nice with the backend. How can i resolve this?