What does this implement/fix? Explain your changes.

IPyObjectDecoder.CanDecode first parameter (objectType) type changed from PyObject to PyType

Does this close any currently open issues?

Related: #1539

Checklist

Check all those that are applicable and complete.

• Make sure to include one or more tests for your change
• If an enhancement PR, please create docs and at best an example
• Add yourself to AUTHORS
• Updated the CHANGELOG