Custom fancy printing of non-empty Dict?

General Usage
4

You need to implement the 3-arg show. Continuing from @CameronBieganek’s MWE:

julia> function Base.show(io::IO, ::MIME"text/plain", d::Dict{Int64, Foo})
           println(io, "A dictionary containing ", length(d), " items.")
       end

julia> d
A dictionary containing 1 items.
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