i am using vue3 with options api

for the storeTest.vue posted below, every time i set a value to it, the respective wachter gets executed, but it also gets excuted even if the i set the same object twice!!
according to my understanding, the wachter in code section watch posted below should be executed if only the store is set to different value of the object.

please let me know why the code in section watch posted below gets executed even if i set the same value to the StoreTest twice?

code:

StoreTest.setters.set({
    geojson: this.#featureRecentlyRequestedProcessing.value.get(DigitizePolygonConstants.CONST_DIGITIZED_FEATURE_PROPERTY_GEOJSON.description),
    order: this.#featureRecentlyRequestedProcessing.value.get(DigitizePolygonConstants.CONST_DIGITIZED_FEATURE_PROPERTY_GEOM_ORDER.description),
});

storeTest.vue:

<script>
import { reactive } from 'vue';

export default {
  }

export const StoreTest = ({
  state: reactive({
    array: [],
  }),
  getters: {
    get() {
      return StoreTest.state.array;
    },
  },
  setters: {
    set(obj) {
        StoreTest.state.array.push(obj);
    },
  },
  actions: {
    initialize() {
        StoreTest.state.array = [];
    },
  }
});
</script>

watch:

created() {
    console.log(verboseTag, 'created()');

    this.$watch(this.refStoreTest.getters.get, (newVal, oldVal) => {
        msg = JSON.stringify({msg: verboseTag + '@watch refStoreTest.getters.get()', newVal: newVal, oldVal: oldVal});
        console.log(msg);
        newVal = newVal.sort((a,b) => a.order-b.order);
        this.refStroeRecentlyHoveredGeometriesProps.setters.set(newVal); 
    }, { deep: true });
}