feat(List)

src/utils/mixin.js

@@ -0,0 +1,7 @@
+export function mixinClasses(dest, ...sources) {
+  for (const source of sources) {
+    const properties = Object.getOwnPropertyDescriptors(source.prototype)
+    delete properties.constructor
+    Object.defineProperties(dest.prototype, properties)
+  }
+}