@Override
    public Optional<ExtensionHandler> createExtensionHandler(Class<?> extensionType, Method method) {
        try {
            return Optional.of(ExtensionHandler.createForSpecialMethod(method));
        } catch (IllegalAccessException e) {
            throw new UnableToCreateExtensionException(e, "Default method handler for %s couldn't unreflect %s", extensionType, method);
        }
    }
Provides {@link ExtensionHandler} instances for interface default methods.
core/src/main/java/org/jdbi/v3/core/extension/DefaultMethodExtensionHandlerFactory.java