QST: is the behavior of Series comparison intended?
#### Question about pandas

For `Series.eq`, In the doc it says "Equivalent to `series == other`" but it seems not true.

Let me show a simple example.

```python
>>> a = pd.Series([1, 1, 1, np.nan], index=['a', 'b', 'c', 'd'])
>>> b = pd.Series([1, np.nan, 1, np.nan], index=['a', 'b', 'd', 'e'])

>>> a.eq(b)
a     True
b    False
c    False
d    False
e    False
dtype: bool

>>> a == b
Traceback (most recent call last):
...
ValueError: Can only compare identically-labeled Series objects
```

Series comparison with `eq` API works, whereas `==` raise an Exception.

Is it intended behavior ??

Thanks :)