Function setAsPrimitive

libs/echarts/echarts-en.simple.js:835–837

* Set an object as primitive to be ignored traversing children in clone or merge

(obj)

 * Set an object as primitive to be ignored traversing children in clone or merge
 */
function setAsPrimitive(obj) {
    obj[primitiveKey] = true;
}

function isPrimitive(obj) {
    return obj[primitiveKey];