Using Archive::Tar:Minitar, is there any way to quickly check if a file
is a tar file or not?

Also I would like to recommend Austin's lib for inclusion in Ruby.  We
already have Zlib so it makes sense to provide for tar.gz files.
Although I think maybe simplify the naming to just Archive::Tar --no
Minitar. Hopefully it will get some additonal features eventually and
not be so "mini" ;-) In so doing, perhaps Zlib belongs in Archive
namespace too?

Thanks,
T.