(@v1.11) pkg> dev Dates
    Updating registry at `~/.julia/registries/General.toml`
ERROR: The following package names could not be resolved:
 * Dates (ade2ca70-3891-5945-98fb-dc099432e06a in manifest but not in project)

(@v1.11) pkg> dev Unicode
ERROR: The following package names could not be resolved:
 * Unicode (4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5 in manifest but not in project)

(@v1.11) pkg> dev SortingAlgorithms
   Resolving package versions...
    Updating `~/.julia/environments/v1.11/Project.toml`
  [a2af1166] + SortingAlgorithms v1.1.1 `~/.julia/dev/SortingAlgorithms`
    Updating `~/.julia/environments/v1.11/Manifest.toml`
  [34da2185] + Compat v4.9.0
  [864edb3b] + DataStructures v0.18.15
  [a2af1166] + SortingAlgorithms v1.1.1 `~/.julia/dev/SortingAlgorithms`