Re: [whatwg/streams] Constructor specification is unclear (#965)

I think developers would find it surprising if subclassing didn't work. My interpretation is that
> This specification uses algorithm conventions very similar to those of [ECMASCRIPT], **whose rules should be used to interpret it** (apart from the exceptions enumerated below).

means that subclassing should work as it does for other constructors defined in ECMASCRIPT.

@domenic, is that what you intended?

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