[Nix-dev] Wrong behaviour on "nix-env -u"

[Lluís Batlle]

Hello all,

to let Delft know, I tried a "nix-env -u '*' --dry-run", and among the
coherent results, I got this line:
upgrading `ise-webpack-10.1.3.1' to `ise-webpack-10.1.3.1'

As far as I understand "-u", this package should not be proposed for
update unless "--eq" is passed.

I have that package described as an override in .nixpkgs/config.nix. I
also don't think it should have any importance.

Do you think "-u" is broken, or I understood wrong its behaviour?

Regards,
Lluís.