WithIOContext: properties of the original IO should not be hidden

[fonsp]

WIP

[github-actions[bot]]

Try this Pull Request!

Open Julia and type:

  julia> import Pkg
julia> Pkg.activate(temp=true)
julia> Pkg.add(url="https://github.com/JuliaPluto/PlutoUI.jl", rev="WithIOContext-layer")
julia> using PlutoUI

Or run this code in your browser:

[fonsp]

nvm