Using inner product `.` from the Python side behaves as outer product.

```py
>>> from pynapl import APL
>>> apl = APL.APL()
>>> dot = apl.op(".")
>>> dot(operator.add)([1, 2, 3], [1, 2, 3])
[[2, 3, 4], [3, 4, 5], [4, 5, 6]]
```

This should raise some sort of error. Instead, it returns the result of `1 2 3 ∘.+ 1 2 3`.

The issue seems to be in the `__op` inner function of `APL.op`, that special cases `"."` in a weird way.