Is flags enum needed in Phobos?

[Era Scarecrow]

  K I have opOpAssign working. I may have to clean up 
documentation a little and clean the unittests up a bit, but it 
all appears to be working.

  Feel free to give it a try.

  I have added opSlice, which returns an array of your enum of all 
the flags it qualifies for. An empty enum (say, zero) never 
qualifies as it has no bits to make it unique (or it would always 
be present no matter what).

  Mmm... I actually hope that's all that's needed for it.