gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV4.java [273:286]:
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        private static void writeMetaProperties(final VertexProperty property, final JsonGenerator jsonGenerator,
                                                final boolean normalize) throws IOException {
            jsonGenerator.writeFieldName(GraphSONTokens.PROPERTIES);
            jsonGenerator.writeStartObject();

            final Iterator<Property<Object>> metaProperties = normalize ?
                    IteratorUtils.list((Iterator<Property<Object>>) property.properties(), Comparators.PROPERTY_COMPARATOR).iterator() : property.properties();
            while (metaProperties.hasNext()) {
                final Property<Object> metaProperty = metaProperties.next();
                jsonGenerator.writeObjectField(metaProperty.key(), metaProperty.value());
            }

            jsonGenerator.writeEndObject();
        }
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV2.java [234:247]:
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        private static void writeMetaProperties(final VertexProperty property, final JsonGenerator jsonGenerator,
                                                final boolean normalize) throws IOException {
            jsonGenerator.writeFieldName(GraphSONTokens.PROPERTIES);
            jsonGenerator.writeStartObject();

            final Iterator<Property<Object>> metaProperties = normalize ?
                    IteratorUtils.list((Iterator<Property<Object>>) property.properties(), Comparators.PROPERTY_COMPARATOR).iterator() : property.properties();
            while (metaProperties.hasNext()) {
                final Property<Object> metaProperty = metaProperties.next();
                jsonGenerator.writeObjectField(metaProperty.key(), metaProperty.value());
            }

            jsonGenerator.writeEndObject();
        }
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV3.java [257:270]:
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        private static void writeMetaProperties(final VertexProperty property, final JsonGenerator jsonGenerator,
                                                final boolean normalize) throws IOException {
            jsonGenerator.writeFieldName(GraphSONTokens.PROPERTIES);
            jsonGenerator.writeStartObject();

            final Iterator<Property<Object>> metaProperties = normalize ?
                    IteratorUtils.list((Iterator<Property<Object>>) property.properties(), Comparators.PROPERTY_COMPARATOR).iterator() : property.properties();
            while (metaProperties.hasNext()) {
                final Property<Object> metaProperty = metaProperties.next();
                jsonGenerator.writeObjectField(metaProperty.key(), metaProperty.value());
            }

            jsonGenerator.writeEndObject();
        }
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