sgdisk 0.8.1-1build1: "--largest-new=0" option not working as documented

the man page for sgdisk(8) states that for the "--largest-new=num" option "A num value of 0 causes the program to use the first available partition number." this does not appear to be the case. using a value of 0 returns the following error:
% sgdisk --version
GPT fdisk (sgdisk) version 0.8.1
% sudo /sbin/sgdisk /dev/xenvg/9e46d655-f4b5-49bd-9e78-7df0a143119a.disk0 --largest-new=0
Could not create partition 0 from 34 to 16777182
Error encountered; not saving changes.

values >0 work and the "--new=partnum:start:end" option (also supporting 0 for the first available partition number) works as expected. from a look at the source code (gdisk-0.8.1/gptcl.cc around lines 276-307; disclaimer: i am not a coder) it appears that "largestPartNum" is tested differently than "partNum" and that the "< 0" check for largestPartNum will always evaluate as false.

thank you.

% lsb_release -rd
Description: Ubuntu 10.04.3 LTS
Release: 10.04
% apt-cache policy gdisk
gdisk:
  Installed: 0.8.1-1build1
  Candidate: 0.8.1-1build1
  Version table:
 *** 0.8.1-1build1 0
        100 /var/lib/dpkg/status
     0.5.1-1 0
        500 http://apt-mirror.us.archive.org/ubuntu/ lucid/universe Packages