gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV4.java [110:140]:
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        private void writeProperties(final Vertex vertex, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider) throws IOException {
            if (vertex.keys().size() == 0)
                return;
            jsonGenerator.writeFieldName(GraphSONTokens.PROPERTIES);
            jsonGenerator.writeStartObject();

            final List<String> keys = normalize ?
                    IteratorUtils.list(vertex.keys().iterator(), Comparator.naturalOrder()) : new ArrayList<>(vertex.keys());
            for (String key : keys) {
                final Iterator<VertexProperty<Object>> vertexProperties = normalize ?
                        IteratorUtils.list(vertex.properties(key), Comparators.PROPERTY_COMPARATOR).iterator() : vertex.properties(key);
                if (vertexProperties.hasNext()) {
                    jsonGenerator.writeFieldName(key);

                    jsonGenerator.writeStartArray();
                    while (vertexProperties.hasNext()) {
                        // if you writeObject the property directly it treats it as a standalone VertexProperty which
                        // will write the label duplicating it. we really only want that for embedded types
                        if (typeInfo == TypeInfo.NO_TYPES) {
                            VertexPropertyJacksonSerializer.writeVertexProperty(vertexProperties.next(), jsonGenerator,
                                    serializerProvider, normalize, false);
                        } else {
                            jsonGenerator.writeObject(vertexProperties.next());
                        }
                    }
                    jsonGenerator.writeEndArray();
                }
            }

            jsonGenerator.writeEndObject();
        }
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV3.java [112:142]:
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        private void writeProperties(final Vertex vertex, final JsonGenerator jsonGenerator, final SerializerProvider serializerProvider) throws IOException {
            if (vertex.keys().size() == 0)
                return;
            jsonGenerator.writeFieldName(GraphSONTokens.PROPERTIES);
            jsonGenerator.writeStartObject();

            final List<String> keys = normalize ?
                    IteratorUtils.list(vertex.keys().iterator(), Comparator.naturalOrder()) : new ArrayList<>(vertex.keys());
            for (String key : keys) {
                final Iterator<VertexProperty<Object>> vertexProperties = normalize ?
                        IteratorUtils.list(vertex.properties(key), Comparators.PROPERTY_COMPARATOR).iterator() : vertex.properties(key);
                if (vertexProperties.hasNext()) {
                    jsonGenerator.writeFieldName(key);

                    jsonGenerator.writeStartArray();
                    while (vertexProperties.hasNext()) {
                        // if you writeObject the property directly it treats it as a standalone VertexProperty which
                        // will write the label duplicating it. we really only want that for embedded types
                        if (typeInfo == TypeInfo.NO_TYPES) {
                            VertexPropertyJacksonSerializer.writeVertexProperty(vertexProperties.next(), jsonGenerator,
                                    serializerProvider, normalize, false);
                        } else {
                            jsonGenerator.writeObject(vertexProperties.next());
                        }
                    }
                    jsonGenerator.writeEndArray();
                }
            }

            jsonGenerator.writeEndObject();
        }
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