Hi,
This is minor.
To me it wasn't obvious whether Randomizer's range was inclusive of Begin and End, from reading the docs. I intuitively expected it to be a half-open range, like in STL, so I expected it to include Begin and not End.
Since I didn't see it anywhere, I wrote a quick test program, and discovered that it is an open range and includes End. If you could put that into the docs, it could save a bit of confusion with people and off-by-one errors down the road :-)