Size computation for allocation may overflow (#99)

* Size computation for allocation may overflow

Performing calculations involving the size of potentially large strings or slices can result in an overflow (for signed integer types) or a wraparound (for unsigned types). An overflow causes the result of the calculation to become negative, while a wraparound results in a small (positive) number.

vendor/github.com/redis/go-redis/v9/internal/util/math.go

@@ -0,0 +1,17 @@
+package util
+
+// Max returns the maximum of two integers
+func Max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+// Min returns the minimum of two integers
+func Min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}