CHECK_STRING      554 iseq.c             magic       = CHECK_STRING(rb_ary_entry(data, i++));
CHECK_STRING      561 iseq.c             name        = CHECK_STRING(rb_ary_entry(data, i++));
CHECK_STRING      562 iseq.c             path        = CHECK_STRING(rb_ary_entry(data, i++));
CHECK_STRING      564 iseq.c             absolute_path = NIL_P(absolute_path) ? Qnil : CHECK_STRING(absolute_path);