std.experimintal is helpfull and I rejoy about. But I think, we can have better place as subpackage. I wrote some ideas about, but they have sunk in other topic. http://forum.dlang.org/thread/ljrm0d$28vf$1@digitalmars.com?page=16#post-mdhlmsxfzaelpdgwfbfh:40forum.dlang.org