public String toString() {
            return this.val;
        }
Tests automatic typed serialization/deserialization for GraphSON 2.0+.

@author Kevin Gallardo (https://kgdo.me)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONMapperPartialEmbeddedTypeTest.java