removes the extra serializer (#402)

src/Speckle.Sdk/Serialisation/V2/ServerObjectManager.cs

@@ -63,7 +63,7 @@ public class ServerObjectManager : IServerObjectManager
     childrenHttpMessage.RequestUri = new Uri($"/api/v2/projects/{_streamId}/object-stream/", UriKind.Relative);
     childrenHttpMessage.Method = HttpMethod.Post;
 
-    Dictionary<string, string> postParameters = new() { { "objectIds", JsonConvert.SerializeObject(objectIds) } };
+    Dictionary<string, object> postParameters = new() { { "objectIds", objectIds } };
     if (!string.IsNullOrWhiteSpace(attributeMask))
     {
       postParameters.Add("attributeMask", attributeMask.NotNull());

tests/Speckle.Sdk.Serialization.Tests/ServerObjectManagerTests.cs

@@ -31,9 +31,12 @@ public class ServerObjectManagerTests : MoqTest
     var jObject = new JObject { { "id", id }, { "value", true } };
     var jObject2 = new JObject { { "id", id2 }, { "value", true } };
     var mockHttp = new MockHttpMessageHandler();
-    Dictionary<string, string> postParameters = new()
+    Dictionary<string, object> postParameters = new()
     {
-      { "objectIds", JsonConvert.SerializeObject(new List<string> { id, id2 }) },
+      {
+        "objectIds",
+        new List<string> { id, id2 }
+      },
     };
 
     string serializedPayload = JsonConvert.SerializeObject(postParameters);