@combo uses insane amounts of memory

Not just @combo
but also @list @combow and @multicol

the following peice of code uses over 1.5 Gigs of mem - and then crashes (Takes about 1 sec)
Tried all the commented lines.

start -> body footer ;
#body -> @list("a","b") ;
#body -> @combo("a","b") ;
#body -> @combow("a","b") ;
body -> @multicol("a b","b c") ;
footer -> @dump("Selected ",body)="Select";

kaptain --version
kaptain 0.72

Linux version 2.6.38-9-generic (buildd@allspice) (gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) ) #43-Ubuntu SMP Thu Apr 28 15:23:06 UTC 2011

Ubuntu 11.04 - Last updated 25 May 2011

Limited memory to 1/2 Gig
ulimit -v 500000

ran kaptain on all tags - same result

kaptain test.kapn
terminate called after throwing an instance of 'St9bad_alloc'
  what(): std::bad_alloc
Aborted

It used entire 500k mem before it aborted.