},
		{
			name:        "isQuantity",
			expr:        `isQuantity("20")`,
			expectValue: trueVal,
		},
		{
			name:        "isQuantity_megabytes",
			expr:        `isQuantity("20M")`,
			expectValue: trueVal,
		},
		{
			name:        "isQuantity_mebibytes",
			expr:        `isQuantity("20Mi")`,
			expectValue: trueVal,
		},
		{

				cost += uint64(math.Ceil(float64(otherSize) * common.StringTraversalCostFactor))
			}

			return &cost
		}
	case "quantity", "isQuantity":
		if len(args) >= 1 {
			cost := uint64(math.Ceil(float64(actualSize(args[0])) * common.StringTraversalCostFactor))
			return &cost
		}
	case "validate":
		if len(args) >= 2 {

			expectRuntimeCost:   1,
		},
		{
			name:                "isQuantity",
			expr:                `isQuantity("20")`,
			expectEstimatedCost: checker.CostEstimate{Min: 1, Max: 1},
			expectRuntimeCost:   1,
		},
		{
			name:                "isQuantity_megabytes",
			expr:                `isQuantity("20M")`,
			expectEstimatedCost: checker.CostEstimate{Min: 1, Max: 1},
			expectRuntimeCost:   1,

			},
		},
		{name: "quantity",
			obj:    objs("20", "200M"),
			schema: schemas(stringType, stringType),
			valid: []string{
				"isQuantity(self.val1)",
				"isQuantity(self.val2)",
				`isQuantity("20Mi")`,
				`quantity(self.val2) == quantity("0.2G") && quantity("0.2G") == quantity("200M")`,