brain does not likes "0"

brain_zero.js

// Requires: http://cloud.github.com/downloads/harthur/brain/brain-0.6.0.js

// Contrived example using string "0" as output.

var net = new brain.NeuralNetwork();

net.train([{input: [0, 0], output: {"F":1}},
           {input: [0, 1], output: {"1":1}},
           {input: [1, 0], output: {"1":1}},
           {input: [1, 1], output: {"0":1}}]);

var expected = net.run([1, 0]);  // {"0":0.044832217084211604,"1":0.8987734592394667,"F":0.03189275580772041}

// toFunction works normally.

var runner = net.toFunction()

JSON.stringify(runner([1,0])) === JSON.stringify(expected)
// true

// Having a "0" as output causes results of `run` to be converted to an Array when using fromJSON

var net_clone = new brain.NeuralNetwork; 
net_clone.fromJSON(net.toJSON())

JSON.stringify(net_clone.run([1,0]))
// "[0.03928773934418956,0.8975583923207543,0.03358100452772138]"

JSON.stringify(net_clone.run([1,0])) == JSON.stringify(expected)
// false!!!

// Work-around: if we use "00" or "#0" or letter "0" instead of number "0" in the output, it works normally.