code: function fract32 (arr) {
  	if (arr.length) {
  		var fract = float32(arr)
  		for (var i = 0, l = fract.length; i < l; i++) {
  			fract[i] = arr[i] - fract[i]
  		}
  		return fract
  	}
  
  	// number
  	return float32(arr - float32(arr))
  }
docs: return fractional part of float32 array