We all love the feeling of writing a nice pipeline, but using anonymous 
functions and captures to deal with :ok tuples can get rather frustrating.

Instead, I'd like the ability to utilise `!>! to tell the Elixir to unwrap 
the tuple for me, only on {:ok, val} - crashing on anything else.

Example:

1
|> twice         # 2
|> ok_tuple      # {:ok, 2}
!> twice         # 4

defp twice(val), do:val*2
defp ok_tuple(val), do: {:ok,val}

I have already started an implementation and it seems pretty simple. The 
only question now is: Is this a valuable addition to Elixir?

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