Changes from Perl 5 (some)

• cleaner, more regular syntax
• removal of "memorized lists of exceptions"
• explicit strong typing (while still allowing for weak typing)
• Full unicode support
• parameter lists
• named arguments
• operator adverbs
• declarative classes, and prototype-based objects
• extensible grammar
• subroutine overloading
• operator overloading
• user-definable operators (from the full Unicode set)
• named regexes
• grammars