Remove splat condition on `Node::Send::Binary`
Remove splat condition on `Node::Send::Binary`

`:[]` and `:[]=` are not touched by `Node::Send::Binary` any more so
we don't need to handle for if the righthand is a splat

kbrock/mutant,tjchambers/mutant,backus/mutest,backus/mutant,nepalez/mutant,backus/mutest