In hindsight, I'm not sure that this bug is useful. I seem to recall that, in the cases where I blamed interdiff for behaving differently from diff by not completing the "basename" of the second file, I was often also comparing one compressed file with one uncompressed file. Eg. vim /usr/share/man/man3/foo.3.gz, :s/foo/bar/, w /tmp/foo.3, q!; interdiff -z /usr/share/man/man3/foo.3.gz /tmp/. The problem is, that with the -z option, there is an ambiguity as to the basename of the second argument; it could be any of: foo.3{,.gz,.bz2}. It might be inconvenient (or even dangerous) to diff the wrong files.
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