Should r.length of type ulong be supported on 32-bit systems?

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On Saturday, 1 October 2016 at 02:31:23 UTC, Andrei Alexandrescu 
wrote:
> https://github.com/dlang/phobos/pull/4827 still allows that but 
> specifies that phobos algorithms are not required to. -- Andrei

In at least some cases it's bad. See: 
http://forum.dlang.org/thread/vqeeyqprqphwktebgaiw@forum.dlang.org?page=1