Session cookie domain option

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And another one from @chrismccord himself:

you could make a plug that calls the Plug.Session init, at runtime

plug MySession, ...
defmodule MySession do
  def init(opts), do: Plug.Sesson.init(opts)
  def call(conn, opts) do
    runtime_opts = Keyword.put(opts, :domain, ...)
    Plug.Session.call(conn, runtime_opts)
  end
end

in this case, I kept init at compiletime, but modified the options before calling the session plug, to do as much work as possible at compile time
but you get the idea? The plug could have just been Plug.Session.call(conn, Plug.Session.init(opts))

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