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44 . Deep copy . . obj copy JSON.JSON.obj . Clone MessageChannel structuralCloneobj Promiseresolve port1 port2 MessageChannel port2. ev resolveev. port1.obj obj clone await structuralCloneobj . API structuralCloneobj oldState history. history.obj document. copy history. history.oldState document. copy obj clone structuralCloneobj . API structuralCloneobj Notification data obj silent . obj clone structuralCloneobj
