>
> OK, I get the basic idea; expunge isn't automatic. Let me rework the
> setProp to get things running again here, and then I'll pick up the
> discussion about that.
>
>
For the archives: This rework sidesteps the issue:

def setProp(self, prop, exclusive=True):
    if exclusive:
        curprops = [p for p in self.props]
        for p in curprops:
            if p.typ == prop.typ:
                session_object(p).expunge(p)
                self.props.remove(p)
    self.props.append(prop)

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