testrunner123
diff --git a/‎CHANGELOG.md
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diff --git a/‎src/embed_tests/TestPySequence.cs
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diff --git a/‎src/runtime/arrayobject.cs
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diff --git a/‎src/runtime/assemblymanager.cs
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diff --git a/‎src/runtime/classobject.cs
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diff --git a/‎src/runtime/converter.cs
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diff --git a/‎src/runtime/exceptions.cs
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diff --git a/‎src/runtime/importhook.cs
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diff --git a/‎src/runtime/indexer.cs
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diff --git a/‎src/runtime/interfaceobject.cs
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@@ -29,6 +29,7 @@ This document follows the conventions laid out in [Keep a CHANGELOG][].
 -   Fixed Visual Studio 2017 compat ([#434][i434]) for setup.py
 -   Fixed crashes when integrating pythonnet in Unity3d ([#714][i714]),
     related to unloading the Application Domain
+-   Fixed interop methods with Py_ssize_t. NetCoreApp 2.0 is more sensitive than net40 and requires this fix. ([#531][p531])
 -   Fixed crash on exit of the Python interpreter if a python class
     derived from a .NET class has a `__namespace__` or `__assembly__`
     attribute ([#481][i481])
@@ -689,3 +690,4 @@ This document follows the conventions laid out in [Keep a CHANGELOG][].
 [p163]: https://github.com/pythonnet/pythonnet/pull/163
 [p625]: https://github.com/pythonnet/pythonnet/pull/625
 [i131]: https://github.com/pythonnet/pythonnet/issues/131
+[p531]: https://github.com/pythonnet/pythonnet/pull/531
@@ -69,10 +69,8 @@ public void TestRepeat()
             PyObject actual = t1.Repeat(3);
             Assert.AreEqual("FooFooFoo", actual.ToString());
 
-            // On 32 bit system this argument should be int, but on the 64 bit system this should be long value.
-            // This works on the Framework 4.0 accidentally, it should produce out of memory!
-            // actual = t1.Repeat(-3);
-            // Assert.AreEqual("", actual.ToString());
+            actual = t1.Repeat(-3);
+            Assert.AreEqual("", actual.ToString());
         }
 
         [Test]
 
@@ -93,7 +93,7 @@ public static IntPtr mp_subscript(IntPtr ob, IntPtr idx)
                 return IntPtr.Zero;
             }
 
-            int count = Runtime.PyTuple_Size(idx);
+            var count = Runtime.PyTuple_Size(idx);
 
             var args = new int[count];
 
@@ -186,7 +186,7 @@ public static int mp_ass_subscript(IntPtr ob, IntPtr idx, IntPtr v)
                 return -1;
             }
 
-            int count = Runtime.PyTuple_Size(idx);
+            var count = Runtime.PyTuple_Size(idx);
             var args = new int[count];
 
             for (var i = 0; i < count; i++)
 
@@ -140,7 +140,7 @@ private static Assembly ResolveHandler(object ob, ResolveEventArgs args)
         internal static void UpdatePath()
         {
             IntPtr list = Runtime.PySys_GetObject("path");
-            int count = Runtime.PyList_Size(list);
+            var count = Runtime.PyList_Size(list);
             if (count != pypath.Count)
             {
                 pypath.Clear();
 
@@ -230,10 +230,10 @@ public static int mp_ass_subscript(IntPtr ob, IntPtr idx, IntPtr v)
             }
 
             // Get the args passed in.
-            int i = Runtime.PyTuple_Size(args);
+            var i = Runtime.PyTuple_Size(args);
             IntPtr defaultArgs = cls.indexer.GetDefaultArgs(args);
-            int numOfDefaultArgs = Runtime.PyTuple_Size(defaultArgs);
-            int temp = i + numOfDefaultArgs;
+            var numOfDefaultArgs = Runtime.PyTuple_Size(defaultArgs);
+            var temp = i + numOfDefaultArgs;
             IntPtr real = Runtime.PyTuple_New(temp + 1);
             for (var n = 0; n < i; n++)
             {
 
@@ -842,7 +842,7 @@ private static void SetConversionError(IntPtr value, Type target)
         private static bool ToArray(IntPtr value, Type obType, out object result, bool setError)
         {
             Type elementType = obType.GetElementType();
-            int size = Runtime.PySequence_Size(value);
+            var size = Runtime.PySequence_Size(value);
             result = null;
 
             if (size < 0)
 
@@ -276,7 +276,7 @@ public static void SetError(Exception e)
         /// </remarks>
         public static bool ErrorOccurred()
         {
-            return Runtime.PyErr_Occurred() != 0;
+            return Runtime.PyErr_Occurred() != IntPtr.Zero;
         }
 
         /// <summary>
 
@@ -155,7 +155,7 @@ public static IntPtr __import__(IntPtr self, IntPtr args, IntPtr kw)
             // hook is saved as this.py_import. This version handles CLR
             // import and defers to the normal builtin for everything else.
 
-            int num_args = Runtime.PyTuple_Size(args);
+            var num_args = Runtime.PyTuple_Size(args);
             if (num_args < 1)
             {
                 return Exceptions.RaiseTypeError("__import__() takes at least 1 argument (0 given)");
 
@@ -56,7 +56,7 @@ internal void SetItem(IntPtr inst, IntPtr args)
 
         internal bool NeedsDefaultArgs(IntPtr args)
         {
-            int pynargs = Runtime.PyTuple_Size(args);
+            var pynargs = Runtime.PyTuple_Size(args);
             MethodBase[] methods = SetterBinder.GetMethods();
             if (methods.Length == 0)
             {
@@ -72,7 +72,7 @@ internal bool NeedsDefaultArgs(IntPtr args)
                 return false;
             }
 
-            for (int v = pynargs; v < clrnargs; v++)
+            for (var v = pynargs; v < clrnargs; v++)
             {
                 if (pi[v].DefaultValue == DBNull.Value)
                 {
@@ -95,7 +95,7 @@ internal IntPtr GetDefaultArgs(IntPtr args)
             {
                 return Runtime.PyTuple_New(0);
             }
-            int pynargs = Runtime.PyTuple_Size(args);
+            var pynargs = Runtime.PyTuple_Size(args);
 
             // Get the default arg tuple
             MethodBase[] methods = SetterBinder.GetMethods();
 
@@ -36,7 +36,7 @@ static InterfaceObject()
         public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw)
         {
             var self = (InterfaceObject)GetManagedObject(tp);
-            int nargs = Runtime.PyTuple_Size(args);
+            var nargs = Runtime.PyTuple_Size(args);
             Type type = self.type;
             object obj;