[bug-diffutils] bug#15459: bug#15459: bug#15459:

[Paul Eggert]

Here's what happens when I compare them.
(The "$ " is the prompt by my shell; it comes
before the command I typed; the other lines are
the output of "diff".)

$ diff old.rar new.rar
Binary files old.rar and new.rar differ
$ diff -a old.rar new.rar
[ lots of binary gibberish ]

This is the documented behavior; I don't see any bug there.
'diff' is designed to compare text files, and doesn't do
very well with binary files.