168   void increment_refcount();

   168   void increment_refcount();

   169   void decrement_refcount();

   169   void decrement_refcount();

   170   bool is_permanent() {

   170   bool is_permanent() {

   171     return (refcount() == PERM_REFCOUNT);

   171     return (refcount() == PERM_REFCOUNT);

   172   }

   172   }

   173 

   174 

   174   // Function char_at() returns the Symbol's selected u1 byte as a char type.

   175   // Function char_at() returns the Symbol's selected u1 byte as a char type.

   175   //

   176   //

   176   // Note that all multi-byte chars have the sign bit set on all their bytes.

   177   // Note that all multi-byte chars have the sign bit set on all their bytes.

   177   // No single byte chars have their sign bit set.

   178   // No single byte chars have their sign bit set.