In the unpack method, include/exclude selectors are used, which have "default excludes" configured. When a POM configures the following, the default excludes are also applied:
However, if no excludes are present, then the default excludes are not applied.
If no excludes are present, then the default excludes should be applied in the same way as if they were. However, I don't believe the exclusions should be on by default (see related issue).