I noticed Glenn's comment at the start of doc/emacs/emacs.texi that 
EDITION (which was "Seventeenth") offers nothing that EMACSVER 
("27.0.50") does not. I'd go further and say that it's a net minus, 
since it's confusing to have competing version numbers for the same thing.

Although separating software version numbers from book edition numbers 
made sense in the old days when most users had only low-resolution 
displays and/or printers, nowadays the practice appears to be more 
trouble than it's worth. So I installed the attached patch, to switch 
the main Emacs manuals to simple version numbers like "27.0". Comments 
welcome.