[whatwg/webidl] Stop assuming "transfer" is same-agent cluster (PR #1422)

The previous text assumed that the AllocateArrayBuffer step would never throw, since it was basically spec fiction for retargeting a pointer. However, if we transfer across agent clusters, memory allocation will be needed. And even then, we shouldn't be normatively asserting that implementations use the pointer-retargeting strategy. Instead, we can explain it in a note.


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  https://github.com/whatwg/webidl/pull/1422

-- Commit Summary --

  * Stop assuming "transfer" is same-agent cluster

-- File Changes --

    M index.bs (25)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1422.patch
https://github.com/whatwg/webidl/pull/1422.diff

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