Implement Core support

Author: fredericDelaporte

src/NHibernate/Collection/Generic/SetHelpers/SetSnapShot.cs

@@ -157,12 +157,26 @@ protected SetSnapShot(SerializationInfo info, StreamingContext context) : base(i
 
 		void ICollection.CopyTo(Array array, int index)
 		{
-			if (!(array is T[] typedArray))
+			if (array is T[] typedArray)
 			{
-				throw new ArgumentException($"Array must be of type {typeof(T[])}.", nameof(array));
+				CopyTo(typedArray, index);
+				return;
 			}
 
-			CopyTo(typedArray, index);
+			if (array == null)
+				throw new ArgumentNullException(nameof(array));
+
+			if (index < 0)
+				throw new ArgumentOutOfRangeException(nameof(index), index, "Array index cannot be negative");
+
+			if (index > array.Length || Count > array.Length - index)
+				throw new ArgumentException("Provided array is too small", nameof(array));
+
+			foreach (var value in this)
+			{
+				array.SetValue(value, index);
+				index++;
+			}
 		}
 
 		bool ICollection.IsSynchronized => false;