[graphviz-interest] I've been through gvpr with a graph with no name

I'm trying out gvpr. I wrote this script test.gvpr to print the graph's name:

BEG_G {
  printf($.name);
}


Using this file test1.gv with a graph named "G"...

graph G { a }

...it prints "G" as expected.


But using this file test2.gv with an unnamed graph...

graph { a }

...it prints "%". Is that intended?


$ gvpr -V
gvpr version 2.33.20130825.0446 (20130825.0446)

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graph G { a }

graph { a }