df.irow(slice(0, df.shape[0])).index != df.irow(slice(0, -1)).index
See these examples.  I think they should return the same, but the last example misses the last row.

```
In [108]: df = pandas.DataFrame(numpy.arange(12).reshape(3, 4))

In [109]: df
Out[109]: 
   0  1   2   3
0  0  1   2   3
1  4  5   6   7
2  8  9  10  11

In [110]: df.irow(slice(0, df.shape[0]))
Out[110]: 
   0  1   2   3
0  0  1   2   3
1  4  5   6   7
2  8  9  10  11

In [111]: df.irow(slice(0, -1))
Out[111]: 
   0  1  2  3
0  0  1  2  3
1  4  5  6  7
```
