Changes for version 0.39
- Added py_is_tuple and made Pl2Py recognize an array ref that has been a tuple before in Python.
- Fixed memory corruption on a Python function calling a Perl function that changed the stack pointer.
- Fixed several memory leaks (scalars and dict keys).
- Fixed wrong refcount of return values in py_eval (RT #48081)
- Fixed accessing Unicode keys in a dict passed from Perl.
- Fixed compatability of t/30floats.t with Python 2.7.
Write Perl subs and classes in Python.