NaN on iOS

[pyenka]

Hello I have an issue on iOS(only)

File: dagre/dist/dagre.core.js
Line: 2137
xs = _.mapValues(xs, function(x) { return -x; });
When x = 0 then function returns -0 and after putting this value to Array it filled with NaNs
result={1:"test"}
result[5]=-0
result={0:NaN, 1:"test", 2:NaN, 3:NaN, 4:NaN, 5:-0}

Used iOS version 10.3.2

Thanks
Pavel

[pyenka]

Could you add smth like "x!==0?-x:x" ?