utf8Slice: don't replace the replacement character
utf8Slice: don't replace the replacement character

beni55/buffer,LinusU/buffer,feross/buffer,loon3/buffer,loon3/buffer,SAGV/buffer,btd/buffer,beni55/buffer,feross/buffer,LinusU/buffer,btd/buffer,SAGV/buffer,feross/buffer,LiuDeng/buffer,LiuDeng/buffer