It is much more convenient than storing the klass, especially when dealing with `object_id` as it allows to update the id2ref table without having to dereference the owner, which may be garbage at that point.
rb_enc_autoload_p
cause:
Thread#raise
Fiber#raise
rb_namespace_available
rb_io_blocking_operation_exit
set_table->bins
set_table->entries
rb_gc_mark_and_move
rb_gc_location