relevant not using instance model type?

I have a simple xform (extracted from a much larger one I'm converting from 3.9) that doesn't quite work as I expected.

I'm using the relevant attribute in a bind to turn on or off the display of a date field depending on the setting of a checkbox which is backed by a field of type boolean.

If I use "relevant='../discharged'" the visibility doesn't change, if I use "relevant='../discharged = true()'" then it does. Since the type in the bind for discharged is "xs:boolean" shouldn't the "= true()" be unnecessary?

<?xml version="1.1" encoding="UTF-8"?>
<xh:html xmlns:xh="http://www.w3.org/1999/xhtml"
         xmlns:fr="http://orbeon.org/oxf/xml/form-runner"
         xmlns:xf="http://www.w3.org/2002/xforms"
         xmlns:xs="http://www.w3.org/2001/XMLSchema"
         xmlns:xxf="http://orbeon.org/oxf/xml/xforms"
         xmlns:xxi="http://orbeon.org/oxf/xml/xinclude">
   <xh:head>
        <xh:title>Untitled Form</xh:title>
        <xf:model id="fr-form-model" xxf:expose-xpath-types="true">
            <xf:instance>
                <xform>
                            <discharged>false</discharged>
                            <dischargedate/>
                </xform>
            </xf:instance>


            <xf:bind ref="discharged"
                  type="xs:boolean"/>
            <xf:bind ref="dischargedate"
                  type="xs:date"
                  relevant="../discharged = true()"/>

            <xf:instance xxf:readonly="true"
                          id="fr-form-metadata"
                          xxf:exclude-result-prefixes="#all">
                <metadata>
                   <application-name>CPF</application-name>
                   <form-name>Unknown</form-name>
                   <title xml:lang="en">Untitled Form</title>
                   <description xml:lang="en"/>
                </metadata>
             </xf:instance>
        </xf:model>

    </xh:head>
   <xh:body>
      <fr:view>
        <fr:body>
            <fr:section class="section">
                <xf:input ref="discharged" appearance="full">
                    <xf:label>Discharged</xf:label>
                </xf:input>
                <xf:input ref="dischargedate">
                    <xf:label>Discharge date</xf:label>
                </xf:input>
            </fr:section>
         </fr:body>
      </fr:view>
   </xh:body>
</xh:html>

I forgot to mention that the form I'm converting from had

relevant="../discharged = 'true'"

which also does not work, as it always returns false.

Hi Brian,

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Thanks Alex,
  I'm following the discussion. Sounds like a difficult one to resolve but once you know how it works then it is easy enough to work with. Bit of a trap for beginners though.

Brian, I am glad this doesn't sound too crazy. We've done some more thinking, and have some ideas on how we could improve this, but we'll most likely let that simmer a bit before changing anything.

Alex