I agree. I've never come across a single author series like this where the developer bias isn't towards one of the approaches and sort of loses the subtle nuances in other libraries of what makes them great. I find it much more interesting when you have experts at each library exemplify the characteristics that make those libraries great. Sure it isn't as apples to apples but you can notice after a while when the code isn't written the way someone who uses the library all the time would do it.
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