@FeatureDescriptor(name = FEATURE_MIXED_LIST_VALUES)
            default boolean supportsMixedListValues() {
                return true;
            }
Supports setting of a {@code List} value.  The assumption is that the {@code List} can contain
arbitrary serializable values that may or may not be defined as a feature itself.  As this
{@code List} is "mixed" it does not need to contain objects of the same type.

@see #supportsMixedListValues()
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/Graph.java