@Override
    public int hashCode() {
        return rawResponse().hashCode();
    }
{@code JSON}-formatted raw Token Introspection Response body. If the {@link GrantedOAuth2AccessToken} was
not parsed out of the raw response body, this value calculated based on the other
{@link GrantedOAuth2AccessToken} values.
oauth2/src/main/java/com/linecorp/armeria/common/auth/oauth2/GrantedOAuth2AccessToken.java