[Webkit-unassigned] [Bug 159869] Built-in generator should support default value for function parameters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159869

--- Comment #1 from youenn fablet <youennf at gmail.com> ---
For ReadableStream.pipeTo, the second parameter is optional, the function length should be 1, while it is 2 if we define the second parameter in the function signature.

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