Adding upstream version 0.2.2.

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

json.go

@@ -0,0 +1,31 @@
+package deepmerge
+
+import (
+	"encoding/json"
+)
+
+// JSON merges the contents of src into dst
+func JSON(dst, src []byte, optionalConfig ...Config) ([]byte, error) {
+	var cfg Config
+	if len(optionalConfig) > 0 {
+		cfg = optionalConfig[0]
+	} else {
+		cfg = Config{PreventMultipleDefinitionsOfKeysWithPrimitiveValue: true}
+	}
+	var dstMap, srcMap map[string]interface{}
+	err := json.Unmarshal(dst, &dstMap)
+	if err != nil {
+		return nil, err
+	}
+	err = json.Unmarshal(src, &srcMap)
+	if err != nil {
+		return nil, err
+	}
+	if dstMap == nil {
+		dstMap = make(map[string]interface{})
+	}
+	if err = DeepMerge(dstMap, srcMap, cfg); err != nil {
+		return nil, err
+	}
+	return json.Marshal(dstMap)
+}