For that degree of change I think it is very legitimate to rename the packages of that part of your project and just make it a part of your project. The changes are too intensive to say that is an extension. Of course crediting the original author on your project page is only polite (if not required by the license).
It would be even nicer (if possible) to contribute your bug fixes back to the original project, or at least report the bugs with what it would take to fix them in the old code base if they were not known issues.
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对于这种程度的更改，我认为重命名项目该部分的包并使其成为项目的一部分是非常合理的。变化太大，不能说是延伸。当然，在项目页面上注明原作者只是出于礼貌（如果许可证没有要求）。
如果可能的话，将您的错误修复贡献回原始项目会更好（如果可能），或者至少报告错误以及在旧代码库中修复它们（如果它们不是已知问题）所需的内容。
For that degree of change I think it is very legitimate to rename the packages of that part of your project and just make it a part of your project. The changes are too intensive to say that is an extension. Of course crediting the original author on your project page is only polite (if not required by the license).
It would be even nicer (if possible) to contribute your bug fixes back to the original project, or at least report the bugs with what it would take to fix them in the old code base if they were not known issues.