Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

util/json.go

@@ -0,0 +1,25 @@
+//  Copyright (c) 2023 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package util
+
+import (
+	"encoding/json"
+)
+
+// Should only be overwritten during process init()'ialization.
+var (
+	MarshalJSON   = json.Marshal
+	UnmarshalJSON = json.Unmarshal
+)