Part of Emacs?
[Dave Love] 1998-09. The bindings of DIGIT and C-DIGIT are swapped and a command bound to SPC deals with a numeric prefix arg or acts normally without such an arg. (Absent a window system, you’d probably want to swap DIGIT and M-DIGIT.) I can’t exactly commend its use; I think it will break the normal use of SPC in Gnus summary buffers, at least. 36.6 Auto-arg.el, passing arguents easily to commands [Anders Lannerback] 1998-09 This is a minor mode for people who uses numbers as prefixes more often than to insert them in text. With this minor mode entering a number is roughly equivalent to entering C-u
