[whatwg/streams] getReader behaviour with empty mode (#517)

I have recently updated getReader implementation in WebKit. Based on spec and tests, getReader({ mode: '' }) does not return a ReadableStreamDefaultReader but throws a RangeError. The patch has been reviewed and committed, but I was asked to check this is not a spec error [1]. Could you confirm this is the intended behaviour?

[1] https://bugs.webkit.org/show_bug.cgi?id=160508#c14

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