The dsidx file is a Core Data store containing information about API symbols and where they are documented. Each symbol has a token type indicating whether it’s a class name, a macro name, etc.
The same technique applied to the 10.8 docset reveals the function name
IOBluetoothOBEXSessionCreateWithIOBluetoothDeviceRefAndChannelNumber. Its length is only 68, so iOS wins with
MFMessageComposeViewControllerTextMessageAvailabilityDidChangeNotification(74), assuming there isn’t an error in the database or in my admittedly shaky SQL.
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