Issue #19286: Adding test demonstrating the failure when a directory is found in the package_data globs.

In 3.3 iterparse accepts a tuple in events (the C accelerator enforces this).
This limitation was lifted in Python 3.4

It is causing trouble like e.g. hanging processes.

The underlying C libraries provide no mechanism for serializing compressor and
decompressor objects, so actually pickling these classes is impractical.
Previously, these objects would be pickled without error, but attempting to use
a deserialized instance would segfault the interpreter.

screen refresh problem.

pseudo-random number generator on fork().