@FeatureDescriptor(name = FEATURE_STRING_IDS)
            default boolean supportsStringIds() {
                return true;
            }
Determines if an {@link Element} has string identifiers as their internal representation. In other
words, if the value returned from {@link Element#id()} is a string value 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