An instance of a subclass of interface.
Initargs for interface .
is used by locate-interface if no matching interface is found first by interface-match-p. In this case, when there is an interface for which
returns true, then locate-interface reinitializes it by reinitialize-interface and returns it.
Note: interface-reuse-p should not be confused with reuse-interfaces-p, which determines the global re-use state.