rhino/src/main/java/org/mozilla/javascript/NativeMap.java [119:149]:
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        ScriptableObject desc = (ScriptableObject) cx.newObject(scope);
        desc.put("enumerable", desc, Boolean.FALSE);
        desc.put("configurable", desc, Boolean.TRUE);
        LambdaFunction sizeFunc =
                new LambdaFunction(
                        scope,
                        "get size",
                        0,
                        (Context lcx, Scriptable lscope, Scriptable thisObj, Object[] args) ->
                                realThis(thisObj, "size").js_getSize());
        sizeFunc.setPrototypeProperty(Undefined.instance);
        desc.put("get", desc, sizeFunc);
        constructor.definePrototypeProperty(cx, "size", desc);
        constructor.definePrototypeProperty(cx, NativeSet.GETSIZE, desc);

        constructor.definePrototypeProperty(
                SymbolKey.TO_STRING_TAG, CLASS_NAME, DONTENUM | READONLY);

        ScriptRuntimeES6.addSymbolSpecies(cx, scope, constructor);
        if (sealed) {
            constructor.sealObject();
        }
        return constructor;
    }

    @Override
    public String getClassName() {
        return CLASS_NAME;
    }

    private static Scriptable jsConstructor(Context cx, Scriptable scope, Object[] args) {
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rhino/src/main/java/org/mozilla/javascript/NativeSet.java [100:130]:
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        ScriptableObject desc = (ScriptableObject) cx.newObject(scope);
        desc.put("enumerable", desc, Boolean.FALSE);
        desc.put("configurable", desc, Boolean.TRUE);
        LambdaFunction sizeFunc =
                new LambdaFunction(
                        scope,
                        "get size",
                        0,
                        (Context lcx, Scriptable lscope, Scriptable thisObj, Object[] args) ->
                                realThis(thisObj, "size").js_getSize());
        sizeFunc.setPrototypeProperty(Undefined.instance);
        desc.put("get", desc, sizeFunc);
        constructor.definePrototypeProperty(cx, "size", desc);
        constructor.definePrototypeProperty(cx, NativeSet.GETSIZE, desc);

        constructor.definePrototypeProperty(
                SymbolKey.TO_STRING_TAG, CLASS_NAME, DONTENUM | READONLY);

        ScriptRuntimeES6.addSymbolSpecies(cx, scope, constructor);
        if (sealed) {
            constructor.sealObject();
        }
        return constructor;
    }

    @Override
    public String getClassName() {
        return CLASS_NAME;
    }

    private static Scriptable jsConstructor(Context cx, Scriptable scope, Object[] args) {
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