No, promote_type is working.

I think this is intended behavior: if you construct a Dict with keys and/or 
values of different types, then it will default to using Any.  For example:

julia> Dict(3=>4, 3.5=>4.5)

Dict{Any,Any} with 2 entries:

  3   => 4

  3.5 => 4.5

This was true in Julia 0.4 as well.   In Julia 0.5, now that functions have 
their own types, Dict(sin=>sin, cos=>cos) also produces Any.

I wonder whether the Dict constructor should use the typejoin of its 
entries instead?

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