Bug?: import-tars misbehaves on Subversion tarballs

import-tars behaves very oddly when I try to import the Subversion
tarballs. (For example,
http://subversion.tigris.org/downloads/subversion-1.4.3.tar.bz2
triggers this problem.) It creates two toplevel directories,
subversion-1.4.3 and subversion-1.4.3subversion. The former seems to
contain at least almost all files; the latter has only a handful of
files, all with very long names.

When I unpack it with GNU tar, I get all the files under a single
"subversion-1.4.3" directory, as expected.

Could it simply be that import-tars can't handle long filenames
somehow? (This is pure speculation, since I know absolutely nothing
about the tar format.)

-- 
Karl Hasselström, kha@treskal.com
      www.treskal.com/kalle