RawExtension for arbitrary JSON

[artasparks]

Kubernetes uses the RawExtension type to represent arbitrary JSON components. Right now in the proto-world, I'm using Struct and in the Go IDL version (soon to come) I'll probably use map[string]interface{} for compatibility. But this is non-standard and the standard type for this purpose is RawExtension.

https://github.com/kubernetes/apimachinery/blob/ed135c5b96450fd24e5e981c708114fbbd950697/pkg/runtime/types.go

type RawExtension struct {
	// Raw is the underlying serialization of this object.
	//
	// TODO: Determine how to detect ContentType and ContentEncoding of 'Raw' data.
	Raw []byte `protobuf:"bytes,1,opt,name=raw"`
	// Object can hold a representation of this extension - useful for working with versioned
	// structs.
	Object Object `json:"-"`
}

[artasparks]

Here's another option, I think -- Ustructured.
https://github.com/kubernetes/apimachinery/blob/d4e5f596ea6e79f9493060696ad6025c6c82599d/pkg/apis/meta/v1/unstructured/unstructured.go