Does the book talk about when it's appropriate to use jQuery & extend it versus writing a microjs lib (or maybe even a Zepto plugin, if that's possible)? Just wondering your take on the idea of small, single responsibility JS libs versus jQuery plugins. Obv, you like extending jQuery enough to write a book about it, but just wondering what thoughts you have or how you choose to approach it.
I've recently written some JS code that works with OpenLayers, the mapping lib. And it could easily be a jQuery plugin - it's just basic boilerplate for working with OL. But maybe it'd be better off as just a little "map helper" lib, a la Mapstraction. Anyway, just an example to discuss if needed.
I haven't looked at these other libraries - I've been happy using jQuery since I first discovered it. So, the book doesn't discuss these either - it is for those that want to use jQuery to a greater extent.