BrowserEnvironment>>forPackages: aCollection

> Lukas, i've noticed that PackageEnvironment instance variable packages is an ordered collection.
>
> Could we make it a Set, so when iterating we reduce iterating the same packages twice,
>
> Of course just in case a duplicated package was passed as an argument ( which was my case!!!!)
> Which leads to iterate possibly multiple times through the classes of packages, which significantly increases time to run when using the whole system.
>
> Fernando
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