[Bug-zile] Zile always changes file's mode on saving?

[J.B. Nicholson-Owens]

I tried the following:

$ touch testfile
$ ls -l testfile
-rw-r--r-- 1 jbn jbn 0 2009-01-31 15:06 testfile
$ chmod 600 testfile
$ ls -l testfile
-rw------- 1 jbn jbn 0 2009-01-31 15:06 testfile
$ zile testfile
[I typed in "hi there." and hit return.  Then ^X^C to save and exit.]
$ ls -l testfile
-rw-r--r-- 1 jbn jbn 10 2009-01-31 15:07 testfile
$ cat testfile
hi there.
$ ls -l testfile
-rw-r--r-- 1 jbn jbn 10 2009-01-31 15:07 testfile

Does zile always set the mode of the file it is editing when saving the 
file?  If so, why?

I'm at a loss to explain what else would have changed the mode of this 
file in the above sequence.

I'm trying zile on Fedora 9 GNU/Linux.

$ cat /proc/version
Linux version 2.6.27.9-libre.73.fc9.i686 (mockbuild@) (gcc version 4.3.0 
20080428 (Red Hat 4.3.0-8) (GCC) ) #1 SMP Tue Dec 16 23:23:21 EST 2008

Thanks.