Slice step 0 causes ZeroDivisionError

[jayvdb]

>>> slice(0,1,0)
slice(0, 1, 0)
>>> [0, 1, 2, 3][slice(0,1,0)]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: slice step cannot be zero
>>> AllStrings("[abcdef]")[0:1:0]
Traceback (most recent call last):
  File "sre_yield/__init__.py", line 137, in __getitem__
    result = SlicedSequence(self, slicer=i)
  File "sre_yield/__init__.py", line 170, in __init__
    self.length = (
ZeroDivisionError: integer division or modulo by zero