Re: [streams] ReadableStream.getReader name is a bit misleading (#308)

> It feels like getReader would make sense if it returned the reader instance the first time, and then after that, returned a 'frozen' reader or something like that instead of throwing an error. An error might be thrown if you try to act upon that reader, rather than simply 'getting' it.

I don't think throwing an error is unsound for getX methods. XMLHttpRequest.responseText can throw an error, for example (I mean, methods are more likely to throw errors than attribute getters).



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