code: func funcMaxOverTime(vals []Value, args Expressions, enh *EvalNodeHelper) Vector {
  	return aggrOverTime(vals, enh, func(values []Point) float64 {
  		max := values[0].V
  		for _, v := range values {
  			if v.V > max || math.IsNaN(max) {
  				max = v.V
  			}
  		}
  		return max
  	})
  }
docs: // === floor(Vector ValueTypeVector) Vector ===
  // === max_over_time(Matrix ValueTypeMatrix) Vector ===