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lib/worker.ex
defmodule PoolSup.Worker do
@moduledoc """
Behaviour definition of worker processes to be managed by `PoolSup`.
To implement `PoolSup.Worker` behaviour it's enough to implement just one function `start_link/1`.
The `start_link/1` callback function is invoked by `PoolSup` to spawn a new process.
The argument passed to worker's `start_link/1` is the second argument of `PoolSup.start_link/4`.
"""
@callback start_link(term) :: GenServer.on_start
end