diff --git a/reactive.js b/reactive.js
index 637df35..63fc8a7 100644
--- a/reactive.js
+++ b/reactive.js
@@ -84,7 +84,7 @@ function Reactive(
                   base: this,
                   prop,
                   path: localpath,
-                  value: value ?? valueThoughtLocalPath,
+                  value: value,
                   oldValue,
                   pathValues,
                   prefix: this._prefix,
@@ -142,10 +142,21 @@ function Reactive(
         }
       },
       triggerUpTree: function () {
-        for (prop of this.keys()) {
-          this.triggerChange(prop);
-          if (this._target.data[prop].isReactive) {
-            this._target.data[prop].triggerUpTree();
+        if (this.target.data.constructor.name === "Array") {
+          for (value of this.target.data) {
+            const prop = this.target.data.indexOf(value);
+            this.receiver.triggerChange(prop);
+            if (this.target.data[prop].isReactive) {
+              this.target.data[prop].triggerUpTree();
+            }
+          }
+        }
+        if (this.target.data.constructor.name === "Object") {
+          for ([prop, value] of Object.entries(this.target.data)) {
+            this.receiver.triggerChange(prop);
+            if (this.target.data[prop].isReactive) {
+              this.target.data[prop].triggerUpTree();
+            }
           }
         }
       },
@@ -219,10 +230,10 @@ function Reactive(
           case "_parent":
           case "_prefix":
           case "_proxy":
+          case "_const":
             return target[prop];
           case "_target":
             return target;
-          case "_data":
           case "_":
             if (target.data.constructor.name === "Object") {
               const ret = Object.fromEntries(
@@ -256,7 +267,7 @@ function Reactive(
           case "triggerChange":
             return target.triggerChange.bind(receiver);
           case "triggerUpTree":
-            return target.triggerUpTree.bind(receiver);
+            return target.triggerUpTree.bind({ target, receiver });
           case "orphan":
             return target.orphan.bind({ receiver, target });
           case "rebuildRelationships":
@@ -294,12 +305,12 @@ function Reactive(
         let oldValue = target.data[prop];
 
         //OBJECTS CAN BE CONST
+
         if (
-          this._const &&
-          target.data[prop] &&
+          target.data?.[prop]?._const &&
+          value?.isReactive &&
           target.data[prop].isReactive &&
-          value.isReactive &&
-          target.data[prop].constructor.name === "Object" &&
+          target.data[prop]._target.data.constructor.name === "Object" &&
           value?._target?.data.constructor.name === "Object"
         ) {
           //ON THIS CASE NO SELF CHANGE
diff --git a/test/reactive.test.js b/test/reactive.test.js
index 90b4168..1ec4216 100644
--- a/test/reactive.test.js
+++ b/test/reactive.test.js
@@ -249,7 +249,7 @@ it("Reactive Array", function () {
   );
 });
 
-it("Remove reactive from parent as itself", function () {
+it("Remove reactive from parent as itself, orphan function", function () {
   const target1 = Reactive(["IM 1"]);
   const target2 = Reactive(["IM 2"]);
   const item3 = Reactive(["IM 3"]);
@@ -265,6 +265,7 @@ it("Remove reactive from parent as itself", function () {
   assert.equal(target2._target._parent.prop, 0);
   item3.orphan();
   assert.equal(item3._target._parent, null);
+  item3.orphan();
 });
 
 it("Iterators", function () {
@@ -303,3 +304,54 @@ it("Set inner properties", function () {
   assert.equal(child._parent, null);
   assert.equal(games._target._parent, null);
 });
+
+it("Const reactive feature", function () {
+  const target1 = Reactive({ 1: 1, 2: 2, 3: 3, 4: 4, 5: 5 }, { const: true });
+  const target2 = Reactive({ 6: 6 });
+  const target3 = Reactive({ 2: 2, 4: 4, 6: 6, 8: 8 });
+  const games = Reactive({ target1, target2, target3 });
+  games.target1 = target2;
+  games.target3 = target2;
+  assert.equal(games.target1, target1);
+  assert.equal(
+    JSON.stringify(target1._),
+    JSON.stringify({
+      1: 1,
+      2: 2,
+      3: 3,
+      4: 4,
+      5: 5,
+      6: 6,
+    })
+  );
+  assert.equal(games.target3, target2);
+});
+
+it("Uptree trigger", function () {
+  const games = Reactive(
+    {
+      number: 1,
+      level1: Reactive(
+        [
+          Reactive(
+            { level3: Reactive({ ok: "OK" }, { prefix: "okTarget" }) },
+            { prefix: "level2" }
+          ),
+        ],
+        {
+          prefix: "level1",
+        }
+      ),
+    },
+    { prefix: "base" }
+  );
+  //SUBSCRIBE to every change in Reactive chain
+  games.level1[0].level3.subscribe("ok", (data) => {
+    const { base, prop, path, pathValues, value, oldValue } = data;
+    assert.equal(JSON.stringify(data.path), JSON.stringify(["ok"]));
+    games.tree = "OK";
+  });
+
+  games.triggerUpTree();
+  assert.equal(games.tree, "OK");
+});