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/push_notifications.go

@@ -0,0 +1,21 @@
+package redis
+
+import (
+	"github.com/redis/go-redis/v9/push"
+)
+
+// NewPushNotificationProcessor creates a new push notification processor
+// This processor maintains a registry of handlers and processes push notifications
+// It is used for RESP3 connections where push notifications are available
+func NewPushNotificationProcessor() push.NotificationProcessor {
+	return push.NewProcessor()
+}
+
+// NewVoidPushNotificationProcessor creates a new void push notification processor
+// This processor does not maintain any handlers and always returns nil for all operations
+// It is used for RESP2 connections where push notifications are not available
+// It can also be used to disable push notifications for RESP3 connections, where
+// it will discard all push notifications without processing them
+func NewVoidPushNotificationProcessor() push.NotificationProcessor {
+	return push.NewVoidProcessor()
+}