1. Is there a technical reason for `choose` not accept a `dtype` argument?
2. Separately, mypy is unhappy with my 2nd argument to `choose`:
Argument 2 to "choose" has incompatible type "Tuple[int, Sequence[float]]";
expected "Union[Union[int, float, complex, str, bytes, generic], Sequence[Union[i
1. I suppose it only uses the (Native int or int64) dtype since each one
would need a code path to run quickly.
2. I would describe this a a bug. I think sequences are converted to arrays
and in this case the conversion is not returning a 2 element object array
but expanding and then concatenation
