It needs to be scoped to the dep so conflicting deps have independent dependencies. If foo 1.1 takes a dep on Bar 1.2, and baz 2.3 takes a dep on Bar 1.4, both

It needs to be scoped to the dep so conflicting deps have independent dependencies. If foo 1.1 takes a dep on Bar 1.2, and baz 2.3 takes a dep on Bar 1.4, both Bar contexts are tested with their respective libraries but forcing Bar to a particular global version can have problems and both versions of Bar are needed to have tested behavior. Examples mentioned and OP change the global behavior vs proper dependency management.