selectservers returns null first array element

3.6.0rc1:

<pre>
cf-agent -KIf ./selectserver.cf
R: Number of active servers 2
R: First server $(alive_servers[0]) fails over to corsair
R: [ servers ] = corsair
R: [ servers ] = raptor
</pre>

3.5.3:

<pre>
cf-agent -KIf ./selectserver.cf
2014-04-11T08:18:11-0500 notice: R: Number of active servers 2
2014-04-11T08:18:11-0500 notice: R: First server corsair fails over to raptor
2014-04-11T08:18:11-0500 notice: R: [ servers ] = corsair
2014-04-11T08:18:11-0500 notice: R: [ servers ] = raptor
</pre>

<pre>
bundle agent test
{
vars:
"hosts" slist =>

{ "corsair", "raptor" }

;
"up_servers" int => selectservers("@(hosts)","5308","","","100","alive_servers");
"servers" slist => getvalues("alive_servers");

classes:
"someone_alive" expression => isgreaterthan("$(up_servers)","0");
"i_am_a_server" expression => regarray("up_servers","$(host)|$(fqhost)");

reports:
someone_alive::
"Number of active servers $(up_servers)";
"First server $(alive_servers[0]) fails over to $(alive_servers[1])";

"[ servers ] = $(servers)";
}
</pre>