reify 是实现接口的强烈首选 - proxy 是繁重的、陈旧的和缓慢的，所以应该尽可能避免.一个实现看起来像:

reify is strongly preferred for implementing interfaces - proxy is heavy-duty, old, and slow, so should be avoided when possible. An implementation would look like:

(reify Doer
  (doSomethin [this input]
    (...whatever...)))