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

@domenic commented on this pull request.



> -    1.  If <a abstract-op>IsDetachedBuffer</a>(|arrayBuffer|) is <emu-val>true</emu-val>, then
-        return the empty byte sequence.
-    1.  Let |data| be the value of |O|’s \[[ArrayBufferData]] [=internal slot=].
-    1.  Return a reference to or copy of (as required) the |length| bytes in |data|
-        starting at byte offset |offset|.
+<hr>
+
+<div algorithm>
+    To <dfn export for="ArrayBuffer">create</dfn> an {{ArrayBuffer}} from a [=byte sequence=]
+    |bytes| in a [=Realm=] |realm|:
+
+    1.  Let |arrayBuffer| be [=?=]
+        [$AllocateArrayBuffer$](|realm|.\[[Intrinsics]].[[{{%ArrayBuffer%}}]], |bytes|'s
+        [=byte sequence/length=]).
+    1. [=ArrayBuffer/Write=] |bytes| into |arrayBuffer|.
+    1. Return |arrayBuffer|.

I often conflate the two in other specs, but I guess in this particular spec we want to be clear.

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