defining methods based on built-in ELisp types

I recently started to use EIEIO in my ELisp programming.  Coming from
CLOS, I naturally started to define methods like

  (defmethod foo ((x string) ...))

  (defmethod foo ((x cons)) ...)

But this seems to be unsupported.  It looks like this lack of
functionality is behind item #2 on the EIEIO wish list ("Method
dispatch for built-in types").  Has there been any progress on this
front?

-- 
Jesse Alama


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