[Numpy-discussion] Make as_strided result writeonly

[Sebastian Berg]

Hi all,

I have just opened a PR, to make as_strided writeonly (as default). The
reasoning for this change is that an `as_strided` array often have self
overlapping memory. However, writing to an array where multiple
elements have the identical memory address can be confusing, and the
results are typically unpredictable.

Considering the danger, the proposal is to add a `readonly=True`. A
poweruser (who that function is designed for anyway), could thus still
get a writeable array.

For the moment, writing to the result would raise a FutureWarning with
`readonly="warn"`.

Do you agree with this, or would it be a major inconvenience?

- Sebastian
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