I don't really agree. Libedit's configuration is different from that of GN 
U readline. It might be useful to document this issue in the documentation 
of the readline module (and of rlcompleter).

Another alternative would be to add code to the readline module that 
emulates the GNU syntax when compeling using libedit, but I don't think 
that's worth the effort.

I would be willing to review such a patch though.