Things get very confusing when putting the wrong name to a UUID in the project file

[KristofferC]

Try a project file with:

[deps]
ForwardDiff = "0f1e0344-ec1d-5b48-a673-e5cf874b6c29"

activate it and then do:

julia> Pkg.add("ForwardDiff")
   Resolving package versions...
    Updating `/tmp/jl_RX2R13/TestWeakDepProject/Project.toml`
  [0f1e0344] + ForwardDiff v0.8.21
    Updating `/tmp/jl_RX2R13/TestWeakDepProject/Manifest.toml`

This now actually installed version 0.8.12 of WebIO (https://github.com/JuliaGizmos/WebIO.jl/releases/tag/v0.8.21) for which this is the UUID for.

[DilumAluthge]

😬

[staticfloat]

Probably worthwhile to have the package printing recognize when you've locally altered the name of your package in opposition to what the loaded registry would call it, and print something like:

julia> Pkg.add("ForwardDiff")
   Resolving package versions...
    Updating `/tmp/jl_RX2R13/TestWeakDepProject/Project.toml`
  [0f1e0344] + WebIO (mapped as ForwardDiff) v0.8.21
    Updating `/tmp/jl_RX2R13/TestWeakDepProject/Manifest.toml`