 incorrectly follows symlinks (and a few other Metapixel bugs reported to Debian)

Please take a look at [Debian bug report 793155](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=793155).

You can find a few more Metapixel bugs reported to Debian [here](https://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=metapixel;dist=unstable).
