# did not return nil exception
to_s >> to_splat. nil.to_splat

# Multiple splats allowed
def foo(*a)
  a
end
foo(1, *[2,3], 4, *[5,6])                        # => [1, 2, 3, 4, 5, 6]

a = [1,2,3]
b = [4,5,6]
[*a, *b]                                         # => [1, 2, 3, 4, 5, 6]