[pro] [MOP] Does intern-eql-specializer serve any real purpose?

Hello CL Pros, Lately I have been improving the MOPishness of MKCL and that brought me in contact with the specification of intern-eql-specializer in AMOP. The EQ requirement on its returned value seem to me to dictate a hash-table implementation (PCL and its derivatives all seem to do just that). The problem I see with this is that it will be a "for ever growing" hash-table with not upper bound in sight. And the "purpose" of such a mandatory built-in memory leak also completely escapes me. Could any of you share some insight on this question, please? Thank you, JCB