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

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