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first, new packages are added at the start.
warning, which prints a warning and
ignores the new pack. Other options are
keep, which is like
but operates silently and
replace, which detaches the old
pack and attaches the new.
true, unregister all packs before registering the new
The predicate attach_packs/2
can be used to attach packages that are bundled with an application.
With the option
ensures that the application only relies on bundled packs.