The important understanding is that existing abstractions shouldn't be "extended" with new functionality, even if the change is backwards compatible.
国有企业党的领导党的建设只能加强、不能削弱。坚持党的领导、加强党的建设是我国国有企业的光荣传统，是国有企业的“根”和“魂”，也是国有企业的独特优势。近年来，国资央企毫不动摇坚持和加强党的全面领导，深化落实“第一议题”等制度，全面抓好基本组织、基本队伍、基本制度，统筹提升各层级各领域党组织建设质效，在科技攻关、脱贫攻坚、抢险救灾等急难险重任务中充分发挥基层党组织和党员作用。。业内人士推荐PDF资料作为进阶阅读
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