public Optional<Type> findElementTypeFor(Type containerType) {
        return findFactoryFor(containerType)
                .flatMap(f -> f.elementType(containerType));
    }
Returns the element type for the given container type.

@param containerType the container type.
@return the element type for the given container type, if available.
core/src/main/java/org/jdbi/v3/core/collector/JdbiCollectors.java