sexp/factory.go
func Parse(buf []byte, offset int) (interface{}, error) {
	obj, _, err := parseReturningOffset(buf, offset)
	return obj, err
}
func Parse(buf []byte, offset int) (interface{}, error) {
	obj, _, err := parseReturningOffset(buf, offset)
	return obj, err
}
// Parse converts a byte array containing R SEXP to a golang object.
// This can be converted to native golang types.