(current_prefix_partial): New var.
(Funiversal_argument): New function, formerly inlined in keyboard.c. (Fnegative_argument, Fdigit_argument): Likewise. (clear_prefix_arg): Moved here from keyboard.c. Don't clear the internal state if we're still building a prefix arg. (finalize_prefix_arg, describe_prefix_arg): Moved from keyboard.c. (syms_of_callint): defsubr the new lisp-callable functions.
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