: VALUE rb_class_real(VALUE cl)
    ðۥ饹䲽ȥ饹 (T_ICLASS) Ф cl 
    ѡ饹éꡢRuby ٥ϪФƤ褤饹֤ޤ

    :
       rb_class_real(RBASIC(klass)->super)

    rb_obj_class(obj) ϡobj Υ饹֤Ѥδؿ(Object#type 
    Ʊ)obj  Qtrue ʤɤǤʤ RBasic ¤ΤΤǤ뤳Ȥ
    狼äƤʤ
       rb_class_real(RBASIC(obj)->klass)
    Ǥɤ(Ϥ rb_obj_class(obj) Ȥ̵)

