I don't think they are that similar under the hood. TypeORM does not implement neither unit of work nor identity map, so the underlying logic is really different I believe.
My main reason to start new project was not to be bound by such a huge community - I don't see how we could maintain back compatibility while introducing UoW and IM to TypeORM. It would have to be another (optional) way to use it, which would make it even more complex (which it already is).
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