Re: [whatwg/streams] Be uniformly lenient in what other-spec algorithms can do (#1131)

@ricea commented on this pull request.

I like it.

>   be an algorithm accepting [=chunk=] objects and returning a number; and if given, |highWaterMark|
  must be a non-negative, non-NaN number.
 
  1. Let |startAlgorithm| be an algorithm that returns undefined.
  1. Let |closeAlgorithmWrapper| be an algorithm that runs these steps:
-  1. If |closeAlgorithm| was given, return the result of running it.
+  1. Let |result| be the result of running |closeAlgorithm|, if |closeAlgorithm| was given, or
+     null otherwise. If this throws an exception |e|, return [=a promise rejected with=] |e|.
+  1. Let |result| be the result of running |closeAlgorithm|, if |closeAlgorithm| was given, or null otherwise.

Are we running _closeAlgorithm_ twice?

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