Hi all,

I found myself in need of a logical-xor function. There's `xor' 
defined in
array.el. But I don't want my package to depend on array.el. So I 
grepped the
git source of some other definition of `xor'. And I found 7 
results: 7 functions
doing the same thing, none of them in a satisfactory place.

Should we figure out where to put the "main" `xor' and declare the 
rest as
obsolete aliases?

I attach the occurrences that I found.

regards,
Oleh