Add TODO for general handling of multi-type arguments
Add TODO for general handling of multi-type arguments

okuta/chainer,jnishi/chainer,hvy/chainer,okuta/chainer,ktnyt/chainer,keisuke-umezawa/chainer,niboshi/chainer,chainer/chainer,jnishi/chainer,hvy/chainer,niboshi/chainer,niboshi/chainer,hvy/chainer,wkentaro/chainer,jnishi/chainer,wkentaro/chainer,hvy/chainer,keisuke-umezawa/chainer,chainer/chainer,chainer/chainer,chainer/chainer,wkentaro/chainer,ktnyt/chainer,ktnyt/chainer,okuta/chainer,pfnet/chainer,tkerola/chainer,keisuke-umezawa/chainer,okuta/chainer,jnishi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,niboshi/chainer,ktnyt/chainer