behavior if right end is less than left end

[invenia]

behavior if right end is less than left end

[omus]

The behaviour is currently deprecated:

julia> Interval(0, -1)
┌ Warning: Constructing an `Interval{T,X,Y}(x, y)` where `x > y` is deprecated, use `Interval{T,Y,X}(y, x)` instead.
│   caller = Interval at interval.jl:118 [inlined]
└ @ Core ~/.julia/dev/Intervals/src/interval.jl:118
Interval{Int64,Closed,Closed}(-1, 0)

The original plan was to error (#57) but returning an empty interval is probably the better choice.

[ExpandingMan]

Thanks, I actually think that I may have recently downgraded due to some package with constraints without having realized it, so now I think I'd better track down whatever was causing it.