Melted sheathing on MacBook Pro power adapter wire

I’ve never had anything like this happen with any power adapter for any device ever before.  The problem was not the same as this well known issue with MacBook Pro power adapters.  Not a pleasant discovery, since I tend to leave this thing plugged in until 100% charged (which can take hours — not always attended), and it sits on the wooden table you see in the background. (more…)