Big whoop

• Why is this good? Why not just commit the working tree?

• Suppose you were adding some code about foozles

        perl-lib/Role/CanFoozle.pm
        perl-lib/Foozle/Basic.pm
        t/foozle/basic.t
        t/foozle/woozle.t
        doc/foozles.pod

• In the course of this you modified the penguin manager also:

        perl-lib/PenguinMgr.pm
        t/penguin_mgr/swim.t
        doc/penguins.pod

• Now you want to record two commits: one for the foozles, one for the penguins