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I just noticed that in my post I accidentally pasted MY implementation twice instead of the old one, sorry for that. Here's the old one for quick comparison:
class ZipExhausted(Exception):
 pass
def zip_longest(*args, **kwds):
 # zip_longest('ABCD', 'xy', fillvalue='-') --> Ax By C- D-
 fillvalue = kwds.get('fillvalue')
 counter = len(args) - 1
 def sentinel():
 nonlocal counter
 if not counter:
 raise ZipExhausted
 counter -= 1
 yield fillvalue
 fillers = repeat(fillvalue)
 iterators = [chain(it, sentinel(), fillers) for it in args]
 try:
 while iterators:
 yield tuple(map(next, iterators))
 except ZipExhausted:
 pass