[Zope] Why doesn't setting REQUEST keys work inside <dtml-with REQUEST> ?

[Don Hopkins]

Here is the output of a test dtml document, and the source, that
demonstrates that setting keys of REQUEST inside a <dtml-with REQUEST> does
not work. Is dtml designed to misbehave this way, or is it a bug? Is the
<dtml-with REQUEST> superfluous? Why does it change the behavior of setting
keys? Is there any way to work around the problem? Thanks!

    -Don


test
This is the test Document.

Foo should be "one", and is "one".
Foo should be "two", and is "two".
Foo should be "three", and is "three".

HOWEVER:

Foo is now "three".
Foo should be "one", and is "three".
Foo should be "two", and is "three".
Foo should be "three", and is "three".


BUT THEN:

Foo is now "three".
Foo should be "one", and is "one".
Foo should be "two", and is "two".
Foo should be "three", and is "three".


<dtml-var standard_html_header>
<h2><dtml-var title_or_id></h2>
<p>
This is the <dtml-var id> Document.
</p>


<dtml-call expr="REQUEST.set('foo', 'one')">
Foo should be "one", and is "&dtml-foo;".<br>
<dtml-call expr="REQUEST.set('foo', 'two')">
Foo should be "two", and is "&dtml-foo;".<br>
<dtml-call expr="REQUEST.set('foo', 'three')">
Foo should be "three", and is "&dtml-foo;".<br>

<p>HOWEVER:<p>

<dtml-with REQUEST>

Foo is now "&dtml-foo;".<br>
<dtml-call expr="REQUEST.set('foo', 'one')">
Foo should be "one", and is "&dtml-foo;".<br>
<dtml-call expr="REQUEST.set('foo', 'two')">
Foo should be "two", and is "&dtml-foo;".<br>
<dtml-call expr="REQUEST.set('foo', 'three')">
Foo should be "three", and is "&dtml-foo;".<br>

</dtml-with>

<p>BUT THEN:<p>

Foo is now "&dtml-foo;".<br>
<dtml-call expr="REQUEST.set('foo', 'one')">
Foo should be "one", and is "&dtml-foo;".<br>
<dtml-call expr="REQUEST.set('foo', 'two')">
Foo should be "two", and is "&dtml-foo;".<br>
<dtml-call expr="REQUEST.set('foo', 'three')">
Foo should be "three", and is "&dtml-foo;".<br>

<dtml-var standard_html_footer>