added support for multi-type waiting plus some cleanup

core/correctness/vars.py

@@ -1,8 +1,12 @@
 
 import os
 
+from multiprocessing import Queue
+from multiprocessing.connection import Connection
 from inspect import signature
 
+from typing import Union
+
 CHAR_LOWERCASE = 'abcdefghijklmnopqrstuvwxyz'
 CHAR_UPPERCASE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
 CHAR_NUMERIC = '0123456789'
@@ -20,6 +24,8 @@ VALID_JUPYTER_NOTEBOOK_EXTENSIONS = [".ipynb"]
 VALID_PATH_CHARS = VALID_NAME_CHARS + "." + os.path.sep
 VALID_TRIGGERING_PATH_CHARS = VALID_NAME_CHARS + ".*" + os.path.sep
 
+VALID_CHANNELS = Union[Connection,Queue]
+
 BAREBONES_NOTEBOOK = {
     "cells": [],
     "metadata": {},