I can offer another example where the new syntax is likely to be of use to 
numpy. We currently have the following as synonyms:
```
np.copyto(a, b, casting='unsafe')
a[...] = b
```
Obviously, it would be nice if we could allow other casting rules for `[]` 
assignment:
```
np.copyto(a, b, casting='safe')
a[..., casting='safe'] = b
```

Eric
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