fixup: respond to michaelficarra review

spec.html

@@ -13724,15 +13724,14 @@ <h1>
   <emu-clause id="sec-built-in-function-objects">
     <h1>Built-in Function Objects</h1>
     <p>A built-in function object is an ordinary object; it must satisfy the requirements for ordinary objects set out in <emu-xref href="#sec-ordinary-object-internal-methods-and-internal-slots"></emu-xref>.</p>
-    <p>In addition to the internal slots required of every ordinary object, a built-in function object must also have the following internal slots:</p>
+    <p>In addition to the internal slots required of every ordinary object (see <emu-xref href="#sec-ordinary-object-internal-methods-and-internal-slots"></emu-xref>), a built-in function object must also have the following internal slots:</p>
     <ul>
       <li>[[Realm]], a Realm Record that represents the realm in which the function was created.</li>
       <li>[[InitialName]], a String that is the initial name of the function. It is used by <emu-xref href="#sec-function.prototype.tostring"></emu-xref>.</li>
     </ul>
     <p>The initial value of a built-in function object's [[Prototype]] internal slot is %Function.prototype%, unless otherwise specified.</p>
     <p>A built-in function object must have a [[Call]] internal method that conforms to the definition in <emu-xref href="#sec-built-in-function-objects-call-thisargument-argumentslist"></emu-xref>.</p>
     <p>A built-in function object has a [[Construct]] internal method if and only if it is described as a “constructor”, or some algorithm in this specification explicitly sets its [[Construct]] internal method. Such a [[Construct]] internal method must conform to the definition in <emu-xref href="#sec-built-in-function-objects-construct-argumentslist-newtarget"></emu-xref>.</p>
-    <p>For a built-in function object defined in this specification, the behaviour specified for it via algorithm steps or other means is “the specification of _F_” for the purposes of step <emu-xref href="#step-call-builtin-function-result"></emu-xref> of <emu-xref href="#sec-builtincallorconstruct" title></emu-xref>.</p>
     <p>An implementation may provide additional built-in function objects that are not defined in this specification.</p>
 
     <emu-clause id="sec-built-in-function-objects-call-thisargument-argumentslist" type="internal method">
@@ -13789,6 +13788,7 @@ <h1>
         1. Perform any necessary implementation-defined initialization of _calleeContext_.
         1. Push _calleeContext_ onto the execution context stack; _calleeContext_ is now the running execution context.
         1. [id="step-call-builtin-function-result"] Let _result_ be the Completion Record that is <emu-meta effects="user-code">the result of evaluating</emu-meta> _F_ in a manner that conforms to the specification of _F_. If _thisArgument_ is ~uninitialized~, the *this* value is uninitialized; otherwise, _thisArgument_ provides the *this* value. _argumentsList_ provides the named parameters. _newTarget_ provides the NewTarget value.
+        1. NOTE: If _F_ is defined in this document, “the specification of _F_” is the behaviour specified for it via algorithm steps or other means.
         1. Remove _calleeContext_ from the execution context stack and restore _callerContext_ as the running execution context.
         1. Return ? _result_.
       </emu-alg>
@@ -28656,6 +28656,7 @@ <h1>ECMAScript Standard Built-in Objects</h1>
   </emu-note>
   <p>Unless otherwise specified every built-in function and every built-in constructor has the Function prototype object, which is the initial value of the expression `Function.prototype` (<emu-xref href="#sec-properties-of-the-function-prototype-object"></emu-xref>), as the value of its [[Prototype]] internal slot.</p>
   <p>Unless otherwise specified every built-in prototype object has the Object prototype object, which is the initial value of the expression `Object.prototype` (<emu-xref href="#sec-properties-of-the-object-prototype-object"></emu-xref>), as the value of its [[Prototype]] internal slot, except the Object prototype object itself.</p>
+  <p>If this specification defines a built-in constructor's behaviour via algorithm steps, then that is its behaviour for the purposes of both [[Call]] and [[Construct]]. If such an algorithm needs to distinguish the two cases, it checks whether NewTarget is *undefined*, which indicates a [[Call]] invocation.</p>
   <p>Built-in function objects that are not identified as constructors do not implement the [[Construct]] internal method unless otherwise specified in the description of a particular function.</p>
   <p>Built-in function objects that are not constructors do not have a *"prototype"* property unless otherwise specified in the description of a particular function.</p>
   <p>Each built-in function defined in this specification is created by calling the CreateBuiltinFunction abstract operation (<emu-xref href="#sec-createbuiltinfunction"></emu-xref>). The values of the _length_ and _name_ parameters are the initial values of the *"length"* and *"name"* properties as discussed below. The values of the _prefix_ parameter are similarly discussed below.</p>