assignAll method
Implementation
void assignAll(Map<K, V> val) {
if (val is RxMap && this is RxMap) {
if ((val as RxMap)._value == (this as RxMap)._value) return;
}
if (this is RxMap) {
final map = (this as RxMap);
if (map._value == val) return;
map._value = val;
map.refresh();
} else {
if (this == val) return;
clear();
addAll(val);
}
}