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Remove repeated unary function calls in an FGL object to create an object that might be smaller to print.
(summarize-fgl-object x) → new-x
This preserves the structure of the input object except that nested calls of the same unary function are replaced by a bogus call of the function on two arguments: the number of nestings and the argument to the innermost call. For example:
(:g-apply intcdr (:g-apply intcdr (:g-apply intcdr (:g-var . x))))
is replaced with
(:g-apply intcdr 3 (:g-var x))