Dotnetcore System.UInt32 conversion issues

Creating UInt32 in python with a value greater than 0x7FFFFFFF in dotnetcore will cause an overflow error. This is due (seemingly) to the fact that .NET core clr will cast the uint to a signed long (64 bits in size on my system) before calling the PyLong_FromUsignedLong function. Using GDB and breaking before the errornous overflow we can examine the created PyLongObject:

The PyLongObject given to C# by the python interpretter that can be converted to a uint using PyLong_AsUnsignedLong

Using PyLong_FromUnsignedLong on the resulting uint gives this:

I have raised an issue on the coreclr project: Issue 26444

FYI changing the function definition from

internal static extern IntPtr PyLong_FromUnsignedLong(uint value);

to

internal static extern IntPtr PyLong_FromUnsignedLong(ulong value);

fixes the issue.

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