Re: [heycam/webidl] Introduce the observable array type (proxy-based) (#840)

bzbarsky commented on this pull request.



> +    1.  Perform [=!=] [$CreateDataProperty$](|handler|, "<code>defineProperty</code>", |defineProperty|).
+    1.  Let |deleteProperty| be [=!=] [$CreateBuiltinFunction$](the steps from [[#es-observable-array-deleteProperty]], « », |realm|).
+    1.  Perform [=!=] [$CreateDataProperty$](|handler|, "<code>deleteProperty</code>", |deleteProperty|).
+    1.  Let |get| be [=!=] [$CreateBuiltinFunction$](the steps from [[#es-observable-array-get]], « », |realm|).
+    1.  Perform [=!=] [$CreateDataProperty$](|handler|, "<code>get</code>", |get|).
+    1.  Let |getOwnPropertyDescriptor| be [=!=] [$CreateBuiltinFunction$](the steps from [[#es-observable-array-getOwnPropertyDescriptor]], « », |realm|).
+    1.  Perform [=!=] [$CreateDataProperty$](|handler|, "<code>getOwnPropertyDescriptor</code>", |getOwnPropertyDescriptor|).
+    1.  Let |has| be [=!=] [$CreateBuiltinFunction$](the steps from [[#es-observable-array-has]], « », |realm|).
+    1.  Perform [=!=] [$CreateDataProperty$](|handler|, "<code>has</code>", |has|).
+    1.  Let |ownKeys| be [=!=] [$CreateBuiltinFunction$](the steps from [[#es-observable-array-ownKeys]], « », |realm|).
+    1.  Perform [=!=] [$CreateDataProperty$](|handler|, "<code>ownKeys</code>", |ownKeys|).
+    1.  Let |preventExtensions| be [=!=] [$CreateBuiltinFunction$](the steps from [[#es-observable-array-preventExtensions]], « », |realm|).
+    1.  Perform [=!=] [$CreateDataProperty$](|handler|, "<code>preventExtensions</code>", |preventExtensions|).
+    1.  Let |set| be [=!=] [$CreateBuiltinFunction$](the steps from [[#es-observable-array-set]], « », |realm|).
+    1.  Perform [=!=] [$CreateDataProperty$](|handler|, "<code>set</code>", |set|).
+    1.  Return [=!=] [$ProxyCreate$](|innerArray|, |handler|).

I haven't thought of a super-compelling reason so far, unfortunately.

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