gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/TraversalSerializersV2.java [255:319]:
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        public BytecodeJacksonDeserializer() {
            super(Bytecode.class);
        }

        @Override
        public Bytecode deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Bytecode bytecode = new Bytecode();

            while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
                final String current = jsonParser.getCurrentName();
                if (current.equals(GraphSONTokens.SOURCE) || current.equals(GraphSONTokens.STEP)) {
                    jsonParser.nextToken();

                    while (jsonParser.nextToken() != JsonToken.END_ARRAY) {

                        // there should be a list now and the first item in the list is always string and is the step name
                        // skip the start array
                        jsonParser.nextToken();
                        
                        final String stepName = jsonParser.getText();

                        // iterate through the rest of the list for arguments until it gets to the end
                        final List<Object> arguments = new ArrayList<>();
                        while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                            // we don't know the types here, so let the deserializer figure that business out
                            arguments.add(deserializationContext.readValue(jsonParser, Object.class));
                        }

                        // if it's not a "source" then it must be a "step"
                        if (current.equals(GraphSONTokens.SOURCE))
                            bytecode.addSource(stepName, arguments.toArray());
                        else
                            bytecode.addStep(stepName, arguments.toArray());
                    }
                }
            }
            return bytecode;
        }

        @Override
        public boolean isCachable() {
            return true;
        }
    }

    final static class EnumJacksonDeserializer<A extends Enum> extends StdDeserializer<A> {

        public EnumJacksonDeserializer(final Class<A> enumClass) {
            super(enumClass);
        }

        @Override
        public A deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Class<A> enumClass = (Class<A>) this._valueClass;
            final String enumName = jsonParser.getText();
            for (final Enum a : enumClass.getEnumConstants()) {
                if (a.name().equals(enumName))
                    return (A) a;
            }
            throw new IOException("Unknown enum type: " + enumClass);
        }

        @Override
        public boolean isCachable() {
            return true;
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/TraversalSerializersV3.java [275:339]:
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        public BytecodeJacksonDeserializer() {
            super(Bytecode.class);
        }

        @Override
        public Bytecode deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Bytecode bytecode = new Bytecode();

            while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
                final String current = jsonParser.getCurrentName();
                if (current.equals(GraphSONTokens.SOURCE) || current.equals(GraphSONTokens.STEP)) {
                    jsonParser.nextToken();

                    while (jsonParser.nextToken() != JsonToken.END_ARRAY) {

                        // there should be a list now and the first item in the list is always string and is the step name
                        // skip the start array
                        jsonParser.nextToken();

                        final String stepName = jsonParser.getText();

                        // iterate through the rest of the list for arguments until it gets to the end
                        final List<Object> arguments = new ArrayList<>();
                        while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
                            // we don't know the types here, so let the deserializer figure that business out
                            arguments.add(deserializationContext.readValue(jsonParser, Object.class));
                        }

                        // if it's not a "source" then it must be a "step"
                        if (current.equals(GraphSONTokens.SOURCE))
                            bytecode.addSource(stepName, arguments.toArray());
                        else
                            bytecode.addStep(stepName, arguments.toArray());
                    }
                }
            }
            return bytecode;
        }

        @Override
        public boolean isCachable() {
            return true;
        }
    }

    final static class EnumJacksonDeserializer<A extends Enum> extends StdDeserializer<A> {

        public EnumJacksonDeserializer(final Class<A> enumClass) {
            super(enumClass);
        }

        @Override
        public A deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            final Class<A> enumClass = (Class<A>) this._valueClass;
            final String enumName = jsonParser.getText();
            for (final Enum a : enumClass.getEnumConstants()) {
                if (a.name().equals(enumName))
                    return (A) a;
            }
            throw new IOException("Unknown enum type: " + enumClass);
        }

        @Override
        public boolean isCachable() {
            return true;
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