The documentation states:

>"It can be used natively in Kubernetes via CRDs or via a RESTful API across other environments, and it doesn't require a change to your application's code in order to be used."

Sorry if this is naive question but I'm not that up on service meshes. Aren't other service meshes generally implemented as sidecar containers? Why wouldn't those also be considered native? Could someone help me understand the distinction of a native service mesh vs non-native? I'm having a hard time getting my head around it.