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The text in http://www.w3.org/TR/2014/CR-WebCryptoAPI-20141211/#SubtleCrypto-Exceptions is not exactly clear to me. Is it saying that whenever throwing OperationError the .message must be precisely the string "The operation failed for an operation-specific reason"? Is it saying that the string is up to the UA? Is it saying that it's up to the UA but if the UA has no idea then "The operation failed for an operation-specific reason" is a good default? Something else? I _think_ the intent is the "up to the UA but this may be a reasonable default" behavior, but that should just be spelled out if so.
Moved to https://github.com/w3c/webcrypto/issues/84