var nopCloserWriterToType = reflect.TypeOf(io.NopCloser(struct {
	io.Reader
	io.WriterTo
}{}))

// unwrapNopCloser return the underlying reader and true if r is a NopCloser
// else it return false.
func unwrapNopCloser(r io.Reader) (underlyingReader io.Reader, isNopCloser bool) {
	switch reflect.TypeOf(r) {
	case nopCloserType, nopCloserWriterToType: