Core or not, I'd prefer coverage of those issues myself. I can't really think of core problems I run into myself, I've been writing core JavaScript for a decade

Core or not, I'd prefer coverage of those issues myself. I can't really think of core problems I run into myself, I've been writing core JavaScript for a decade or something, but there's lots of intricacies with those other things where I wouldn't mind tips. Different audiences, I suppose. I browsed the TOC one kind reviewer was nice enough to list, saw there wasn't anything I was interested in or had trouble with lately, and moved on.