Fix instable array during in-place modification in uksort

The array isn't just observable if the array has RCn, but also if it is inside a
reference that is RCn. By-ref parameters are al

Fix instable array during in-place modification in uksort

The array isn't just observable if the array has RCn, but also if it is inside a
reference that is RCn. By-ref parameters are always RCn and as such always
observable.

Fixes GH-13279
Closes GH-13285

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