PyObject_IsInstance(), PyObject_RichCompareBool() and _PyDict_Contains()
to check for and handle errors correctly.

Original patch by David Moore.

See also issue 24017.

fix a resource warning.

Fixed segmentation fault in sqlite3.Row constructor with faked cursor type.
Fixed system error in the comparison of faked types.SimpleNamespace.

Clement Rouault.

Made test_pprint and test_trace discoverable.

avoid passing the test accidently because slice.__hash__ is None.

IDLE.  Patch by Martin Panter.

when a directory with the chosen name already exists on Windows as well as
on Unix.  tempfile.mkstemp() now fails early if parent directory is not
valid (not exists or is a file) on Windows.

Issue #23985: Fix a possible buffer overrun when deleting a slice from the front of a bytearray and then appending some other bytes data.

Patch by Martin Panter.

I missed that this change was applied to both branches.

email.utils.make_msgid() to strengthen the uniqueness of the message ID.