new operator ':=', it assigns a value to a variable by deep copy

kern/clone-value.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
+// All rights reserved.
+
+// clone-value.go
+package kern
+
+func Clone(v any) (c any) {
+	if v == nil {
+		return
+	}
+	switch unboxed := v.(type) {
+	case int64:
+		c = unboxed
+	case float64:
+		c = unboxed
+	case string:
+		c = unboxed
+	case bool:
+		c = unboxed
+	case *ListType:
+		c = unboxed.Clone()
+	case *DictType:
+		c = unboxed.Clone()
+	default:
+		c = v
+	}
+	return
+}

kern/dict-type.go

@@ -155,7 +155,7 @@ func (dict *DictType) GetItem(key any) (value any, exists bool) {
 func (dict *DictType) Clone() (c *DictType) {
 	c = newDict(nil)
 	for k, v := range *dict {
-		(*c)[k] = v
+		(*c)[k] = Clone(v)
 	}
 	return
 }

kern/list-type.go

@@ -133,6 +133,15 @@ func (ls1 *ListType) Equals(ls2 ListType) (answer bool) {
 	return
 }
 
+func (ls1 *ListType) Clone() (ls2 *ListType) {
+	ls := make(ListType, len(*ls1))
+	for i, item := range *ls1 {
+		ls[i] = Clone(item)
+	}
+	ls2 = &ls
+	return
+}
+
 func (dict *ListType) IndexDeepSameCmp(target any) (index int) {
 	var eq bool
 	var err error