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The maxsize argument when initializing a Queue is expected to be an int (technically anything that can be compared to an int). However the class takes any value. In Python 3 this throws "TypeError: unorderable types" once e.g. .put() is called.
On the basis that errors should not pass silent, should maxsize be checked for compatibility at initialization time? e.g.
Desired:
>>> import queue
>>> q = queue.Queue(range(10))
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib/python3.5/queue.py", line nnn, in __init__()
 ...
TypeError: 'range' object cannot be interpreted as an integer
Actual:
Python 3.5.0rc2 (default, Aug 25 2015, 20:29:07) 
[GCC 5.2.1 20150825] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import queue
>>> q = queue.Queue(range(10)) # Silently accepts an invalid maxsize
>>> q.put('foo')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib/python3.5/queue.py", line 127, in put
 if self.maxsize > 0:
TypeError: unorderable types: range() > int()

The norm for pure python code is to duck type when objects are used rather than when they are passed in.
The Queue module is very old and for the most part, its straight-forward design has worked out well (i.e. there aren't any real usability issues in actual practice).
Accordingly, I'm going to decline the request.