Defmap - embed maps into a module for faster/easier lookups. Feedback please

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I’m not sure you need a lib and a macro for this. You can get the same thing with something like this (untested):

defmodule Foo do
  for {code, message} <- {400 => "Bad Request", 401 => "Unauthorized", 403 => "Forbidden"} do
    def get(unquote(code)), do: {:ok, unquote(message)}
  end
  def get(_), do: :error
end

I occasionally use this technique.

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