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This is a cleanup I started to notice a need for during the BinarySink work. It removes a lot of faffing about casting things to char * or unsigned char * so that some API will accept them, even though lots of such APIs really take a plain 'block of raw binary data' argument and don't care what C thinks the signedness of that data might be - they may well reinterpret it back and forth internally. So I've tried to arrange for all the function call APIs that ought to have a void * (or const void *) to have one, and those that need to do pointer arithmetic on the parameter internally can cast it back at the top of the function. That saves endless ad-hoc casts at the call sites.