neo now supports string literals. Addition operator on strings is defined to be concatenation.

sample session:

neo] a = 'Apple'
object @0x2146090
type = String reference_count = 1 value = 'Apple' length=5
neo] b = ' '
object @0x21460d0
type = String reference_count = 1 value = ' ' length=1
neo] c = 'iCloud'
object @0x2146190
type = String reference_count = 1 value = 'iCloud' length=6
neo] a+b+c
object @0x21463d0
type = String reference_count = 0 value = 'Apple iCloud' length=12
neo]