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promote_type(Union{Void, Null, Int}, Float64) == Union{Null, Float64} on Julia 0.7 #47

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nalimilan opened this issue Oct 12, 2017 · 1 comment

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nalimilan commented Oct 12, 2017

On latest Julia master, I see this:

julia> promote_type(Union{Void, Null, Int}, Float64)
Union{Nulls.Null, Float64}

It seems to be due to this definition, as removing it fixes the problem:

Base.promote_rule(::Type{T}, ::Type{Union{S,Null}}) where {T,S} =
    Union{promote_type(T, S), Null}

On Julia 0.6, this returns Any. I'm not sure when it changed on master but that's the first time I notice this. Is that a Julia bug?

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nalimilan commented Nov 18, 2017

@JeffBezanson Would you say this is the correct behavior for Julia?

nalimilan mentioned this issue

Add missing and Missing JuliaLang/julia#24653

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