gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/AddVertexStartStep.java [167:212]:
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        clone.internalParameters = this.internalParameters.clone();
        clone.withConfiguration = this.withConfiguration.clone();
        clone.userProvidedLabel = this.userProvidedLabel;
        return clone;
    }

    @Override
    public Object getLabel() {
        Object label = internalParameters.get(T.label, () -> Vertex.DEFAULT_LABEL).get(0);
        if (label instanceof ConstantTraversal) {
            return ((ConstantTraversal<?, ?>) label).next();
        }
        return label;
    }

    @Override
    public void setLabel(Object label) {
        this.configure(T.label, label);
    }

    @Override
    public Map<Object, List<Object>> getProperties() {
        return Collections.unmodifiableMap(internalParameters.getRaw(T.id, T.label));
    }

    @Override
    public boolean removeProperty(Object k) {
        if (internalParameters.contains(k)) {
            internalParameters.remove(k);
            return true;
        }
        return false;
    }

    @Override
    public boolean removeElementId() {
        if (this.internalParameters.contains(T.id)) {
            this.internalParameters.remove(T.id);
            return true;
        }
        return false;
    }

    @Override
    public void addProperty(final Object key, final Object value) {
        configureInternalParams(key, value);
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gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/AddVertexStep.java [155:200]:
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        clone.internalParameters = this.internalParameters.clone();
        clone.withConfiguration = this.withConfiguration.clone();
        clone.userProvidedLabel = this.userProvidedLabel;
        return clone;
    }

    @Override
    public Object getLabel() {
        Object label = internalParameters.get(T.label, () -> Vertex.DEFAULT_LABEL).get(0);
        if (label instanceof ConstantTraversal) {
            return ((ConstantTraversal<?, ?>) label).next();
        }
        return label;
    }

    @Override
    public void setLabel(Object label) {
        this.configure(T.label, label);
    }

    @Override
    public Map<Object, List<Object>> getProperties() {
        return Collections.unmodifiableMap(internalParameters.getRaw(T.id, T.label));
    }

    @Override
    public boolean removeProperty(Object k) {
        if (internalParameters.contains(k)) {
            internalParameters.remove(k);
            return true;
        }
        return false;
    }

    @Override
    public boolean removeElementId() {
        if (this.internalParameters.contains(T.id)) {
            this.internalParameters.remove(T.id);
            return true;
        }
        return false;
    }

    @Override
    public void addProperty(final Object key, final Object value) {
        configureInternalParams(key, value);
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