[thehappyfellow]

Of course practitioners shouldn't expect to understand the bleeding edge without investing a lot in learning the subject.

However providing people with software engineering background an easier on ramp for understanding PLT would be nice, wouldn't it?

[throwaway81523]

Yes, Harper's book that I linked above is good for that, imho. It looks like the PDF that is there now is a subset of the chapters of the 2nd edition. In an older version of the page, there was a complete pdf of the 1st edition and that's the one that I used. You might be able to find it in Wayback if you go back to 2015 or so.