Puppet erb converts int to str in yaml dump

gistfile1.txt

root@master:/etc/puppet# cat /tmp/modules/foo/templates/foo
<%-
  def yaml_indent(conds)
    return_val = []
    tmp_val = conds.to_yaml.split("\n")
    tmp_val.delete('---')
    tmp_val.each do |val|
      return_val << "        " + val
    end
    return_val.join("\n")
  end
-%>


<%= yaml_indent(@foo) %>
root@master:/etc/puppet# cat /tmp/modules/foo/manifests/init.pp
class foo {


  $foo = {"a" => 1, "b" => "he"}

  file { '/tmp/foo':
      content => template('foo/foo'),
      owner   => root,
      group   => root,
      mode    => 644,
  }
}
root@master:/etc/puppet# puppet apply --modulepath /tmp/modules -e 'include foo'
Already evaluated rest at /var/lib/gems/2.0.0/gems/facter-2.4.6/lib/facter/ec2.rb:21, reevaluating anyways
Already evaluated rest at /var/lib/gems/2.0.0/gems/facter-2.4.6/lib/facter/ec2.rb:38, reevaluating anyways
Already evaluated rest at /var/lib/gems/2.0.0/gems/facter-2.4.6/lib/facter/gce.rb:4, reevaluating anyways
Notice: Compiled catalog for master.vagrant.local in environment vagrant in 0.26 seconds
Notice: Finished catalog run in 0.01 seconds
root@master:/etc/puppet# cat /tmp/foo


        ---
          a: "1"
          b: he