arg def extended

src/registry/registries/command-put.ts

@@ -46,13 +46,14 @@ export namespace CommandPut {
   );
 
   preRegistry.extend('arg', (data, cmd, ctx, nativeType) => {
-    const arg = cmd._arguments[data.index];
+    let arg = cmd._arguments[data.index];
     if (arg) {
+      arg = {};
+      cmd._arguments[data.index] = arg;
+    }
     applyNativeTypeToArg(arg, nativeType);
-    } else if (data.decl) {
-      const decl = { ...data.decl };
-      applyNativeTypeToArg(decl, nativeType);
-      cmd._arguments[data.index] = decl;
+    if (data.decl) {
+      Object.assign(arg, data.decl);
     }
   });