FunctionGenerator: NodeValue is not recognized

[Aklakan]

The function binder does not yet recognize NodeValues; only Nodes are recognized. It would be useful to support both the RDF and the SPARQL level.

@IriNs("http://www.example.org/")
boolean foo(Node thisParamWorks, NodeValue thisDoesNot) {
  return true;
}

Invoking SELECT (<http://www.example.org/foo>(1, 2) AS ?x) {} fails with error

java.lang.RuntimeException: TypeMapper does not contain an entry for the java class null derived from class org.apache.jena.sparql.expr.NodeValue
	at org.aksw.jenax.arq.functionbinder.FunctionGenerator.wrap(FunctionGenerator.java:222) ~[jenax-arq-plugins-bundle-5.0.0-1-SNAPSHOT.jar:?]
	at org.aksw.jenax.arq.functionbinder.FunctionBinder.lambda$factory$0(FunctionBinder.java:173) ~[jenax-arq-plugins-bundle-5.0.0-1-SNAPSHOT.jar:?]