Set hide_email_addresses in person of type xsd:boolean

Right now person representation https://launchpad.net/+apidoc/1.0.html#person has a field named "hide_email_addresses" which is a string. It should be a boolean

Right now the WADL shows

 </wadl:param>
      <wadl:param style="plain" required="false"
                  path="$['hide_email_addresses']"
                  name="hide_email_addresses">
        <wadl:doc xmlns="http://www.w3.org/1999/xhtml">
                Hide my email addresses from other Launchpad users
        </wadl:doc>
</wadl:param>

It should be

 </wadl:param>
      <wadl:param style="plain" required="false"
                  path="$['hide_email_addresses']"
                  name="hide_email_addresses"
                  type="xsd:boolean">
        <wadl:doc xmlns="http://www.w3.org/1999/xhtml">
                Hide my email addresses from other Launchpad users
        </wadl:doc>
</wadl:param>

Quoting from Leronard's IRC log

<m4n1sh>in https://launchpad.net/+apidoc/1.0.html#person the field hide_email_addresses
<m4n1sh> "hide_email_addresses"
<m4n1sh> what should it be set?
<m4n1sh> true/false?
<leonardr>m4n1sh: yes
<m4n1sh>leonardr: can it be reflected in the WADL?
<m4n1sh> WADL file
<leonardr> yes, we could set type="xsd:boolean" as we have for dates