double.sided parameter requires string value?

The double.sided parameter seems to require a string value, which appears counter-intuitive since its documented default is a zero.

<xsl:param name="double.sided" select="0"></xsl:param>

is default and disables double-sided layout. So

<xsl:param name="double.sided" select="1"></xsl:param>

looks like it should enable it but doesn't. Either of the following will:

<xsl:param name="double.sided" select="'1'"></xsl:param>
<xsl:param name="double.sided">1</xsl:param>

Perhaps this should be ticketed?

Best
Stephen Taylor