code: func funcMinOverTime(vals []Value, args Expressions, enh *EvalNodeHelper) Vector {
  	return aggrOverTime(vals, enh, func(values []Point) float64 {
  		min := values[0].V
  		for _, v := range values {
  			if v.V < min || math.IsNaN(min) {
  				min = v.V
  			}
  		}
  		return min
  	})
  }
docs: // === min_over_time(Matrix ValueTypeMatrix) Vector ===