@@ -380,11 +380,13 @@ export class ObservableArray<T> extends StubArray {
 	}
 
 	toString(): string {
-		return "[mobx.array] " + Array.prototype.toString.apply(this.$mobx.values, arguments);
+		this.$mobx.atom.reportObserved();
+		return Array.prototype.toString.apply(this.$mobx.values, arguments);
 	}
 
 	toLocaleString(): string {
-		return "[mobx.array] " + Array.prototype.toLocaleString.apply(this.$mobx.values, arguments);
+		this.$mobx.atom.reportObserved();
+		return Array.prototype.toLocaleString.apply(this.$mobx.values, arguments);
 	}
 }
 
 
@@ -273,6 +273,43 @@ test('is array', function(t) {
     t.end();
 })
 
+test('stringifies same as ecma array', function(t) {
+    const x = mobx.observable([]);
+    t.equal(x instanceof Array, true);
+
+    // would be cool if these two would return true...
+	t.equal(x.toString(), "");
+	t.equal(x.toLocaleString(), "");
+	x.push(1, 2)
+	t.equal(x.toString(), "1,2");
+	t.equal(x.toLocaleString(), "1,2");
+    t.end();
+})
+
+test("observes when stringified", function (t) {
+	const x = mobx.observable([]);
+	let c = 0;
+	mobx.autorun(function() {
+        x.toString();
+		c++;
+    });
+	x.push(1);
+	t.equal(c, 2);
+	t.end();
+})
+
+test("observes when stringified to locale", function (t) {
+	const x = mobx.observable([]);
+	let c = 0;
+	mobx.autorun(function() {
+        x.toLocaleString();
+		c++;
+    });
+	x.push(1);
+	t.equal(c, 2);
+	t.end();
+})
+
 test('peek', function(t) {
     var x = mobx.observable([1, 2, 3]);
     t.deepEqual(x.peek(), [1, 2, 3]);
Original file line number	Diff line number	Diff line change
`@@ -380,11 +380,13 @@ export class ObservableArray<T> extends StubArray {`
`380`	`380`	`}`
`381`	`381`
`382`	`382`	`toString(): string {`
`383`		`- return "[mobx.array] " + Array.prototype.toString.apply(this.$mobx.values, arguments);`
	`383`	`+ this.$mobx.atom.reportObserved();`
	`384`	`+ return Array.prototype.toString.apply(this.$mobx.values, arguments);`
`384`	`385`	`}`
`385`	`386`
`386`	`387`	`toLocaleString(): string {`
`387`		`- return "[mobx.array] " + Array.prototype.toLocaleString.apply(this.$mobx.values, arguments);`
	`388`	`+ this.$mobx.atom.reportObserved();`
	`389`	`+ return Array.prototype.toLocaleString.apply(this.$mobx.values, arguments);`
`388`	`390`	`}`
`389`	`391`	`}`
`390`	`392`