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In step 12.3 at http://dev.w3.org/2006/webapi/WebIDL/#dfn-overload-resolution-algorithm, V is used though it's never defined. It seems like it should be defined to arg_i.
Thanks; this happened to get fix as part of this commit: https://github.com/heycam/webidl/commit/ff92fdfb5c44c6a18347c8c9f2df3e87c74efabc