How can an empty array be an instance of an array that contains something?

Ihe Onwuka <[email protected]>
Newsgroups gmane.text.xml.saxon.help,gmane.text.xml.xsl.general.mulberrytech
Message-ID <CALfs7+wL0DywKwN+g9bLACjZXqfHiVUuKKhOG_xixS4_YfUBpQ@mail.gmail.com>
This returns true for xs:string and xs:integer

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
                xmlns:array="http://www.w3.org/2005/xpath-functions/array"
                xmlns:map="http://www.w3.org/2005/xpath-functions/map"
                version="3.0" expand-text="yes"
exclude-result-prefixes="array map xs">
   <xsl:template name="xsl:initial-template">
  {[] instance of array(xs:string)}
   </xsl:template>
</xsl:stylesheet>

Getting this on saxon 10.1

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