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== DETAILS - the free() method of the hid_driver_t interface needs its parameter defined as const in order for the compiler to stop complaining about losing const-ness. - if a joypad list is created with <MAX_USERS slots in it, the destroy() function will crash because it assumes there are MAX_USERS entries. To do this, the allocate function creates n+1 slots, and gives the last slot a canary value that the destroy() method can then watch for when iterating through the list.