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var freeParseFloat = parseFloat;
var nativeMin = Math.min,
nativeRandom = Math.random;
var rand = nativeRandom();
console.log(freeParseFloat('1e-' + ((rand + '').length - 1)));
console.log(nativeMin(0 + (rand * (5 - 0 + freeParseFloat('1e-' + ((rand + '').length - 1)))), 5));