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Clarify in-place operations mirror special case behaviour #299

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Merged
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Nov 4, 2021
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Clarify in-place operations mirror special case behaviour #299

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2217e08
Clarify in-place operations mirror special case behaviour
honno Nov 2, 2021
d6a5fa1
Clarify that in-place ops follow all functionality of standard ops
honno Nov 3, 2021
ef8813a
Update copy
kgryte Nov 4, 2021
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5 changes: 5 additions & 0 deletions spec/API_specification/array_object.md
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Expand Up @@ -156,6 +156,11 @@ an array object supporting the following in-place Python operators:
An in-place operation must not change the dtype or shape of the in-place array
as a result of {ref}`type-promotion` or {ref}`broadcasting`.

An in-place operation must have the same behavior (including special cases) as
its respective binary (i.e., two operand, non-assignment) operation. For example,
after in-place addition `x1 += x2`, the modified array `x1` must always equal the
result of the equivalent binary arithmetic operation `x1 = x1 + x2`.

```{note}

In-place operators must be supported as discussed in {ref}`copyview-mutability`.
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