reverse -containers +bytestring

reverse :: ByteString -> ByteString
bytestring Data.ByteString, bytestring Data.ByteString.Char8
O(n) reverse xs efficiently returns the elements of xs in reverse order.
reverse :: ByteString -> ByteString
bytestring Data.ByteString.Lazy, bytestring Data.ByteString.Lazy.Char8
O(n) reverse xs returns the elements of xs in reverse order.