I noticed that my old copy of the Sunset Basic Home Wiring book has a front cover picture that appears to show an incorrect wiring. I have posted three pictures here: the original cover, the instructions for a GFCI, and a photoshopped cover showing how it seems to me should be done.
I was at a professional lumber store today and saw their TimberTech decking display. The material with the thinly striated surface had a bad case of mildew. I'm not sure the mildew problems people have been talking about are limited to Trex. Of course, the means people use to clean Trex mildew would probably work on this mildew.