Unexpected ('a', 'b')[fn:position()] result

I am using XSLT 2.0, XPath 2.0, and Saxon-B 8.9 (which I dearly love). 

This one has driven me completely batty. By all tests and appearances, 

<xsl:template match="/">
 <xsl:sequence select="fn:position()"/>
</xsl:template>

returns the integer 1,

<xsl:template match="/">
 <xsl:sequence select="('a', 'b')[1]"/>
</xsl:template>

returns the string 'a', and

<xsl:template match="/">
 <xsl:sequence select="('a', 'b')[fn:position()]"/>
</xsl:template>

returns ('a', 'b'). 

Why is this? Everything tells me the last expression should evaluate to 'a'. Did I miss something?

Thanks for reading,
Rachel Basse


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