Expressions now support function definition

utils.go

@@ -101,3 +101,15 @@ func anyFloat(v any) (float float64, ok bool) {
 	}
 	return
 }
+
+func CopyMap[K comparable, V any](dest, source map[K]V) map[K]V {
+	for k, v := range source {
+		dest[k] = v
+	}
+	return dest
+}
+
+func CloneMap[K comparable, V any](source map[K]V) map[K]V {
+	dest := make(map[K]V, len(source))
+	return CopyMap(dest, source)
+}