Work on reducing allocation leaks in read_number(). This is now improved, but not yet satisfactory.

src/arith/integer.c

@@ -86,6 +86,7 @@ struct cons_pointer make_integer( int64_t value, struct cons_pointer more ) {
         struct cons_space_object *cell = &pointer2cell( result );
         cell->payload.integer.value = value;
         cell->payload.integer.more = more;
+        inc_ref(result);
     }
 
     debug_print( L"make_integer: returning\n", DEBUG_ALLOC );