First commit for private source control. Older commits available on Github.

Assets/Plugins/SerializedCollections/Runtime/Scripts/SerializedCollectionsUtility.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace AYellowpaper.SerializedCollections
+{
+    public static class SerializedCollectionsUtility
+    {
+        public static bool IsValidKey(object obj)
+        {
+            // we catch this error if we are not on the main thread and simply return false as we assume the object is null
+            try
+            {
+                return !(obj == null || (obj is Object unityObject && unityObject == null));
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public static bool KeysAreEqual<T>(T key, object otherKey)
+        {
+            return (object)key == otherKey || key.Equals(otherKey);
+        }
+    }
+}