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id vs cast

Hi,

I am dealing with a function that returns a void pointer. I take this
pointer and cast it to "TheClass" like this:
TheClass *myObject;
myObject = (TheClass *)thePointer;

I am curious if there is any benefit to doing:
id *myObject = thePointer;

instead of casting the pointer as I have above.

I have used both ways with no problems. Is there a performance benefit
either way?

Thanks
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