Re: [heycam/webidl] Add and improve operations on BufferSources (#987)

@annevk commented on this pull request.



> +
+    <p class="note">This will throw an exception if |arrayBuffer| has an \[[ArrayBufferDetachKey]]
+    that is not undefined, such as a {{Memory|WebAssembly.Memory}}'s {{Memory/buffer}}.
+    [[WASM-JS-API-1]]
+</div>
+
+<div algorithm>
+    To <dfn for="ArrayBuffer" export>transfer</dfn> an {{ArrayBuffer}} |arrayBuffer|, optionally
+    given a [=Realm=] |realm|:
+
+    1.  Asssert: [=!=] [$IsSharedArrayBuffer$](|arrayBuffer|) is false.
+    1.  Assert: [=!=] [$IsDetachedBuffer$](|arrayBuffer|) is false.
+    1.  Let |arrayBufferData| be |arrayBuffer|.\[[ArrayBufferData]].
+    1.  Let |arrayBufferByteLength| be |arrayBuffer|.\[[ArrayBufferByteLength]].
+    1.  Perform [=?=] [$DetachArrayBuffer$](|arrayBuffer|).
+    1.  If |realm| is not given, let |realm| be |arrayBuffer|.\[[Realm]].

They do have a realm per IDL, see https://heycam.github.io/webidl/#dfn-associated-realm. See also https://github.com/tc39/ecma262/issues/1333.

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