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NFC for the moment, because the bufchain is always specially constructed to hold exactly the same data that would have been passed in to the function as a (pointer,length) pair. But this API change allows get_userpass_input to express the idea that it consumed some but not all of the data in the bufchain, which means that later on I'll be able to point the same function at a longer-lived bufchain containing the full stream of keyboard input and avoid dropping keystrokes that arrive too quickly after the end of an interactive password prompt.