Emit partial types

[AArnott]

For the data types, please emit them with the partial keyword so we can add members to them outside the generated code.

[arg0d]

Whats your use case? What do you consider data types? Records?

[AArnott]

Data types would be the unifii dictionary defined types. I believe you emit these as records. Non-data type examples: types that surround methods that provide the interop or infrastructure support. No need for partial there.