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Hmm: one more thing that needs to be fixed before this can be committed---the error messages for maltyped start, stop and step are less informative than they used to be.
Before the patch:
 >>> slice(0, 2.3, 4).indices(5)
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 TypeError: slice indices must be integers or None or have an __index__ method
After the patch:
 >>> slice(0, 2.3, 4).indices(5)
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 TypeError: 'float' object cannot be interpreted as an integer
I'll fix this.