Page label issue in citeproc-ruby

pages-test.csl

<?xml version="1.0" encoding="UTF-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl" version="1.0"
class="in-text">
  <info>
    <title>Output just pages</title>
    <id>pages-test</id>
    <updated>2014-01-27T18:01:24+00:00</updated>
  </info>
  <macro name="author-short">
    <names variable="author">
      <name form="short"/>
    </names>
  </macro>
  <macro name="author">
    <names variable="author">
      <name name-as-sort-order="all" initialize-with=". "/>
    </names>
  </macro>
  <macro name="issued">
    <date variable="issued">
      <date-part name="year"/>
    </date>
  </macro>
  <citation>
    <sort>
      <key macro="issued"/>
      <key macro="author-short"/>
    </sort>
    <layout prefix="(" suffix=")" delimiter="; ">
      <text macro="author-short"/>
      <text macro="issued" prefix=" "/>
    </layout>
  </citation>
  <bibliography>
    <layout suffix=".">
      <group delimiter=" ">
        <label variable="page"/>
        <text variable="page"/>
      </group>
    </layout>
  </bibliography>
</style>

pagestest.bib

@article{greenwade93,
    author  = "George D. Greenwade",
    title   = "The {C}omprehensive {T}ex {A}rchive {N}etwork ({CTAN})",
    year    = "1993",
    journal = "TUGBoat",
    volume  = "14",
    number  = "3",
    pages   = "342--351"
}

See here: https://gist.github.com/inukshuk/8657987