JSON response being converted to camel casing in local environment

The Azure Function serialize the result in Camel Casing when running in the local development environment while the results are serialized in Pascal Casing while running on the cloud. The same code generates different JSON result while running on development machines and on cloud.

Runtimes:
-Functions Runtime Version - 2.0.11651.0
-Functions Core Tools Version - 220.0.0-beta.0

```csharp
public static async Task Run([HttpTrigger(AuthorizationLevel.Function, "get", Route = "TestCasing")]HttpRequest req, TraceWriter log)
{
var result = new {PropertyName1 = "Foo", PropertyName2 = "Bar" };
return new OkObjectResult(result);
}
```
When running on local development machines, it outputs the following json
`
{"propertyName1":"Foo","propertyName2":"Bar"}
`

When the same code is hosted on the cloud, the following json is produced
`
{"PropertyName1":"Foo","PropertyName2":"Bar"}
`

We expect the same casing in json result as defined in the response model.