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This PR is stemmed from IDN parsing issue (hexojs/hexo-generator-feed#63). It was later (partially) fixed in hexojs/hexo-generator-feed#82, without encodeURI the root value. Full fix is later proposed in hexojs/hexo-generator-feed#88.
IDN incompatibility is also found in hexo-generator-sitemap and open_graph().
All the proposed fixes actually share similar function, so I propose to put it in hexo-util instead.