1. Is it more efficient to malloc a uint8_t array and call NSData 'init no copy', rather than pass in an array allocated with a fixed length on the stack to the init method that makes a copy of the bytes?
2. Does NSMutableData's implementation simply just cast it's internal bytes to const in the 'bytes' method, or does it internally copy the bytes into a new autoreleased NSData and return the 'bytes' for that copy, for example?
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