[perl #131335] [BUG] The empty set should be a subset of any set

[Jan-Olof Hendig via RT]

On Sat, 20 May 2017 06:03:00 -0700, c...@zoffix.com wrote:
> > The above should return True
> 
> WolframAlpha disagrees:
> https://www.wolframalpha.com/input/?i=%E2%88%85+%E2%8A%82+%E2%88%85

Yup, this ticket should be closed/rejected.