What do you think is the single most important feature of Perl 6?
I personally believe that chromatic knows better, so I'm pillaging him:
- lexically malleable grammars
- the default grammar
- continuations
- co-routines
- generators
- hyperoperators
- multiple dispatch
- multiple simultaneous versions of the same module existing in process
- STM
- hypothetical variables
My personal (humourous) addition:
- its ability to become a typical troll's flamebait
As far as your options are concerned, I'd rename some of them as follows:
- static typing => the type system
- parameter specification => function signatures
- "real" OOP => solid object system, with roles and metaclasses
- lazy eval => lazy lists