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I've added some comments to the commits (if you click through), except a couple that were self-explanatory. I'm not as fond of the compilation buffer as I was when I...

@kleewho Thanks for looking! The problem with making little feature branches (which I do in other situations) is that I only really run with one Emacs state and my session...

@shiftkey: thanks much for addressing this! The OS'es we use are primarily macOS and Linux (AMD64 indeed), with Windows a distant third use case that won't be missed as badly...