Re: [whatwg/streams] Allow aborting an ongoing pipe operation using AbortSignals (#744)

domenic commented on this pull request.



>  </div>
 
 <emu-alg>
   1. If ! IsReadableStream(*this*) is *false*, return <a>a promise rejected with</a> a *TypeError* exception.
   1. If ! IsWritableStream(_dest_) is *false*, return <a>a promise rejected with</a> a *TypeError* exception.
   1. Set _preventClose_ to ! ToBoolean(_preventClose_), set _preventAbort_ to ! ToBoolean(_preventAbort_), and set
      _preventCancel_ to ! ToBoolean(_preventCancel_).
+  1. If _signal_ is not *undefined*, and _signal_ is not an instance of the {{AbortSignal}} interface, return <a>a

Yeah, I think this is the right thing for now.

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