QST: Integer floordiv by nullable integer series containing zero
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#### Question about pandas

Hello Pandas, while working on cuDF binops, I noticed this edge case:

```python
1 // pd.Series([0], dtype='Int64')
```

```
0    0
dtype: Int64
```

I'm not 100% sure what the right behavior here is, but we're thinking it's maybe to raise. I was wondering if anyone on the pandas side had thought about this and has strong feelings about what the answer _should_ be here. For standard division, casting to float and returning `inf` seems sensible. But with floor division the point is to return an int. 

Thanks so much for any thoughts. 