Comparison always discards whitespace-only text nodes

[AirQuick]

test.xsl (does nothing)

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" />

test.xml (contains a whitespace-only text node between <span>)

<?xml version="1.0" encoding="UTF-8"?>
<p><span>foo</span>&#x20;<span>bar</span></p>

test.xspec (expects no space between <span>)

<?xml version="1.0" encoding="UTF-8"?>
<x:description stylesheet="test.xsl" xmlns:x="http://www.jenitennison.com/xslt/xspec">
	<x:scenario label="When a function returns a node containing a space">
		<x:call function="exactly-one">
			<x:param href="test.xml" select="element(p)" />
		</x:call>
		<x:expect label="Expecting no space should be Failure">
			<p><span>foo</span><span>bar</span></p>
		</x:expect>
	</x:scenario>
</x:description>

x:expect should be Failure, but it is Success.
This is critical when testing mixed content such as HTML, DITA.

[AirQuick]

Also https://groups.google.com/d/msg/xspec-users/phNmPTdPNwY/-tunJB4iEC0J