Fix definition of promote_rule(Missing, Missing) #27256
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I don't believe this definition is ever actually used (because `promote_type(::Type{T}, ::Type{T}) where {T}` would intercept it earlier), but it is still useful for preventing the ambiguities test to complain. As such, we might as well make it correct.
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I don't believe this definition is ever actually used (because
promote_type(::Type{T}, ::Type{T}) where {T}would intercept it earlier), but it is still useful for preventing the ambiguities test to complain. As such, we might as well make it correct.