<snip>
I'm not sure whether the param stack should be regarded as an external API for digester, though. While we can fix all param rules (CallParamRule, ObjectParamRule, etc) we would break any variants of these written by users if we do this. Unfortunately I think this is not acceptable.
i think that probably the behaviour of the param stack needs to be backward compatible.
the limitation of only having two stacks is one that the named stacks stuff was intended to address. maybe it'd be possible to use named stacks to add this functionality which preserving backwards compatibility.
- robert
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