D-Programming-Language/phobos — pull request #1236 by Safety0ff (2013-03-31 22:58:45+00:00)
Title: BigInt enhancements: add opCast!bool and make std.math.abs work

http://d.puremagic.com/issues/show_bug.cgi?id=4120
http://d.puremagic.com/issues/show_bug.cgi?id=6486