lntypes+routing: add generic Min/Max functions

lntypes/comparison.go

@@ -0,0 +1,26 @@
+package lntypes
+
+import "golang.org/x/exp/constraints"
+
+// Number defines a type constraint for numbers.
+type Number interface {
+	constraints.Integer | constraints.Float
+}
+
+// Max returns the greater of the two inputs.
+func Max[N Number](op1 N, op2 N) N {
+	if op1 > op2 {
+		return op1
+	}
+
+	return op2
+}
+
+// Min returns the lesser of the two inputs.
+func Min[N Number](op1 N, op2 N) N {
+	if op1 < op2 {
+		return op1
+	}
+
+	return op2
+}