Store array resize fix (#1908) (#1909)

* Fix array resize bug (#1908)

* add store test class

src/Proto.Actor/Utils/TypedDictionary.cs

@@ -35,7 +35,7 @@ public void Add<TKey>(TValue value)
 
             if (id >= _values.Length)
             {
-                Array.Resize(ref _values, (int)(id * _growthFactor));
+                Array.Resize(ref _values, (int)((id + 1) * _growthFactor));
             }
 
             _values[id] = value;

tests/Proto.Actor.Tests/StoreTests.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Proto.Tests;
+
+public class StoreTests
+{
+    [Fact]
+    public async Task Given_RootContextStore_SetAndGetCustomObject()
+    {
+        await using var system = new ActorSystem();
+        var context = system.Root;
+
+        var toStore = new StoreType();
+        context.Set(toStore);
+        var fromStore = context.Get<StoreType>();
+
+        Assert.Same(toStore, fromStore);
+    }
+
+    class StoreType
+    {
+    }
+}