@FeatureDescriptor(name = FEATURE_CUSTOM_IDS)
            default boolean supportsCustomIds() {
                return true;
            }
Determines if an {@link Element} has a specific custom object as their internal representation.
In other words, if the value returned from {@link Element#id()} is a type defined by the graph
implementations, such as OrientDB's {@code Rid}, then this method should be return {@code true}.
<p/>
Note that this feature is most generally used for determining the appropriate tests to execute in the
Gremlin Test Suite.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/Graph.java