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Raised on http://lists.w3.org/Archives/Public/public-webcrypto/2014Jul/0056.html The definition for "usage intersection" ( https://dvcs.w3.org/hg/webcrypto-api/raw-file/ee10c81e1141/spec/Overview.html#concept-usage-intersection ) defines "usage intersection" as a concept over two arrays. This is misleading/incorrect, as the usage intersection is conducted over two IDL sequences.
https://dvcs.w3.org/hg/webcrypto-api/rev/b70e27d42387