Allow encoding of Lazy Enumerable collections (Ruby 2.0)

[mkonecny]

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Consider the following:

z = [{"x" => 5}, 2, 3].lazy.map{ |i| i}
#=> #<Enumerator::Lazy: #<Enumerator::Lazy: [{"x"=>5}, 2, 3]>:map>
z.first
#=> {"x"=>5}

Encoding hash z returns the following unexpected chunk:

=> ""#Enumerator::Lazy:0x00000001cb0448""

encoder = Yajl::Encoder.new
encoder.encode(z) do |chunk|
    if chunk.nil? # got our terminator, encoding is done
      close_connection_after_writing
    else
      puts chunk
    end
end

It seems to me that one of the potential advantages of yajl is I could avoid using to_a on large lists to save memory.

[joevandyk]

This would be very nice.