[graphviz-interest] problem using lua library, bezier assertion

I have here a test script that is producing unexpected results:

#!/usr/bin/env lua
require ("gv")
g = gv.readstring("digraph G {a->b}")
gv.render(g, 'dot');

and here is are the results:

# ./gv_failure_test_case.lua
Assertion failed: (bz.size % 3 == 1), function bezier_bb, file emit.c,
line 3871.
Abort trap: 6

I have tried this with the current stable version, the latest
development snapshot, and current git head.
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