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Manipulating pointers proper can be accomplished through most of the
other operations defined in the Pointers dictionary, such as
make-pointer, pointer-address, and pointer-eq.
When using them, keep in mind that they merely manipulate the Lisp
representation of pointers, not the values they point to.
The pointers’ representations differ from implementation to
implementation and have different types. foreign-pointer
provides a portable type alias to each of these types.