In ReverseWrapperBase, the check to ensure the return value is a tuple fails

[Max Bélanger]

In pybindgen/typehandlers/base.py, in 'ReverseWrapperBase', the following check is used in 'generate()' to ensure 'py_retval' is a tuple:

## parse the return value
## this ensures that py_retval is always a tuple
self.before_call.write_code('py_retval = Py_BuildValue((char*) "(N)", py_retval);')

However, when my Python function returns a tuple, this check seems to wrap the tuple into another tuple. The following call to 'PyArg_ParseTuple' fails because of this. Removing the call to 'Py_BuildValue' makes it work.

I've patched in the following check to do this only if it's not already a tuple: "if (!PyTuple_Check(py_retval))".
Do you have a better solution to this?