Re: [whatwg/dom] Add abort reason to AbortSignal (PR #1027)

@nidhijaju commented on this pull request.



>  
 <ol>
  <li><p>Let <var>signal</var> be a new {{AbortSignal}} object.
 
  <li><p>Set <var>signal</var>'s [=AbortSignal/aborted flag=].
 
+ <li><p>If <var>reason</var> is undefined or not given, then let <var>reason</var> be a new

I might be misunderstanding but isn't "undefined" and "not given" (i.e. "missing") two different things so we should check for both? 
Also, if `reason` is not given, doesn't that technically mean it is not an existing variable? Or is it considered existing if it is an optional argument?

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