Updated style of Set#add spec, added a couple tests
Updated style of Set#add? spec
Updated style of Set#all? spec, added a couple tests
Updated style of Set#any? spec, added a couple tests
Make sure Hash#clear does not mutate receiver
Tweaked implementation of Hash#remove spec
Removed extraneous line from Hash#any? spec
Updated style of Hash#clear spec
Updated style of Set#compact spec