I'd love to solve it with `__getitem__`... Since most subclasses will
have that defined that with just a single argument, calling it from
`oindex` with an extra mode argument set will properly fail, so good
in that sense (although one better ensure a useful error message...).
Another option would be to store the mode as an additional part in the
index tuple (perhaps as a dict), i.e., in python form do something
like:
```
def __getitem__(self, index):
if isinstance(index, tuple) and isinstance(index[-1], dict):
*index, kwargs = index
else:
kwargs = {}
return self._internal_indexer(index, **kwargs)
```
This way, if all a subclass does is to call `super(SubClass,
self).__getitem__(index)` (as does `Quantity`; it does not look at the
index at all), it would work automagically. Indeed, one could them
decide the type of index even by regular slicing in the following way
```
array[:, 10, {'mode': 'vector'}]
```
which one could of course have a special token for (like `np.newaxis`
for `None`), so that it would be something like
```
array[:, 10, np.vector_index]
```
However, looking at the above, I fear this is too baroque even by my standards!
-- Marten
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