kubernetes/staging/src/k8s.io/apimachinery/pkg/runtime/extension.go

// RawExtension intentionally avoids implementing value.UnstructuredConverter for now because the
// signature of ToUnstructured does not allow returning an error value in cases where the conversion
// is not possible (content type is unrecognized or bytes don't match content type).
func rawToUnstructured(raw []byte, contentType string) (interface{ … }

func (re RawExtension) guessContentType() string { … }

func (re *RawExtension) UnmarshalJSON(in []byte) error { … }

var cborNull …

var cborSelfDescribed …

func (re *RawExtension) UnmarshalCBOR(in []byte) error { … }

// MarshalJSON may get called on pointers or values, so implement MarshalJSON on value.
// http://stackoverflow.com/questions/21390979/custom-marshaljson-never-gets-called-in-go
func (re RawExtension) MarshalJSON() ([]byte, error) { … }

func (re RawExtension) MarshalCBOR() ([]byte, error) { … }