Using Slice#[] to take advantage of COW'd strings
Using Slice#[] to take advantage of COW'd strings

This avoids copying the backing buffer because the new String can
reference a subrange of the original.

mahemoff/excon,ilackarms/excon,TheNeatCompany/excon,cloudfoundry-incubator/excon,excon/excon,liftforward/excon,hammerdr/excon,wadetandy/excon