General suggestions

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I find your book offers more depth than I’ve seen elsewhere. A great addition (you may already have planned it) would be to have an appendix or late chapter describing the bootstrap process at run-time, especially what happens under the hood – even if at a high level – as to e.g. when/how dynamic finders are created, services, scaffolding etc..This would help those who need to do extra configuration or want to develop.

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