rhino/src/main/java/org/mozilla/javascript/NativeSet.java [28:53]:
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        constructor.setPrototypePropertyAttributes(DONTENUM | READONLY | PERMANENT);

        constructor.definePrototypeMethod(
                scope,
                "add",
                1,
                (Context lcx, Scriptable lscope, Scriptable thisObj, Object[] args) ->
                        realThis(thisObj, "add").js_add(NativeMap.key(args)),
                DONTENUM,
                DONTENUM | READONLY);
        constructor.definePrototypeMethod(
                scope,
                "delete",
                1,
                (Context lcx, Scriptable lscope, Scriptable thisObj, Object[] args) ->
                        realThis(thisObj, "delete").js_delete(NativeMap.key(args)),
                DONTENUM,
                DONTENUM | READONLY);
        constructor.definePrototypeMethod(
                scope,
                "has",
                1,
                (Context lcx, Scriptable lscope, Scriptable thisObj, Object[] args) ->
                        realThis(thisObj, "has").js_has(NativeMap.key(args)),
                DONTENUM,
                DONTENUM | READONLY);
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rhino/src/main/java/org/mozilla/javascript/NativeWeakSet.java [36:61]:
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        constructor.setPrototypePropertyAttributes(DONTENUM | READONLY | PERMANENT);

        constructor.definePrototypeMethod(
                scope,
                "add",
                1,
                (Context lcx, Scriptable lscope, Scriptable thisObj, Object[] args) ->
                        realThis(thisObj, "add").js_add(NativeMap.key(args)),
                DONTENUM,
                DONTENUM | READONLY);
        constructor.definePrototypeMethod(
                scope,
                "delete",
                1,
                (Context lcx, Scriptable lscope, Scriptable thisObj, Object[] args) ->
                        realThis(thisObj, "delete").js_delete(NativeMap.key(args)),
                DONTENUM,
                DONTENUM | READONLY);
        constructor.definePrototypeMethod(
                scope,
                "has",
                1,
                (Context lcx, Scriptable lscope, Scriptable thisObj, Object[] args) ->
                        realThis(thisObj, "has").js_has(NativeMap.key(args)),
                DONTENUM,
                DONTENUM | READONLY);
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