public static <T> InternalLooseImportBindingBuilder<T> createLooseBinding(LinkedBindingBuilder<T> binder, Key<T> concreteType) {
        checkNotNull(binder, "binder is null");
        checkNotNull(concreteType, "concreteType is null");

        return new InternalLooseImportBindingBuilder<>(binder, concreteType);
    }
Binding builder for loose bindings (with optional default).
guice/src/main/java/org/jdbi/v3/guice/internal/InternalLooseImportBindingBuilder.java