private Stream<BoundCustomizer> parameterCustomizers() {
        final Parameter[] parameters = method.getParameters();

        return IntStream.range(0, parameters.length)
                .boxed()
                .flatMap(i -> eachParameterCustomizers(parameters[i], i));
    }
Base handler for annotations' implementation classes.
sqlobject/src/main/java/org/jdbi/v3/sqlobject/statement/internal/CustomizingStatementHandler.java