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A `:queue` wrapper with improvements in API and addition of Protocol implementations

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qex lib impls enumerable.ex
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lib/impls/enumerable.ex

defimpl Enumerable, for: Qex do
def count(%Qex{data: q}) do
{:ok, :queue.len(q)}
end
def member?(%Qex{data: q}, item) do
{:ok, :queue.member(item, q)}
end
def reduce(%Qex{data: q}, acc, fun) do
Enumerable.reduce(:queue.to_list(q), acc, fun)
end
end