Olivier Hénot

Just a small bump to not forget about this, since this also impacts PR #558

Resolved by #558.

Superseded by #590.

Closing this issue since linear algebra related features should be reported in [IntervalLinearAlgebra.jl](https://github.com/JuliaIntervals/IntervalLinearAlgebra.jl).

I believe we can close this, now that decorations are the default #590.

This is fixed on master, note that the return type is `Interval{Rational{Int64}}`. While returning `Interval{Float64}` gives a sharper answer, we should avoid type promotion when a valid `Interval{Rational{Int64}}` can be...

Closing this issue since on master: ```Julia julia> @btime $(Ref(x))[] + $(Ref(y))[] 5.875 ns (0 allocations: 0 bytes) [0.3999999, 0.600001] julia> @btime $(Ref(x2))[] + $(Ref(y2))[] 8.842 ns (0 allocations: 0...

I believe this issue has been in resolved with #560.

In the 1.0-dev branch, we made several changes to improve reliability, at the cost of convenience. In this regard, the removal of `Interval

I think that we still need to have `Interval