p5200-Core Enhancements

    p5200-Experimental Subroutine signatures
    p5200-subs now take a prototype attribute 


p5180-Core Enhancements

    p5180-New mechanism for experimental features
    p5180-Hash overhaul
        p5180-Hash randomization 


p5160-Core Enhancements

    p5160-use VERSION
    p5160-__SUB__
    p5160-New and Improved Built-ins
        p5160-More consistent eval
        p5160-substr lvalue revamp
        p5160-Return value of tied 
     

p5140-Core Enhancements

p5140-Regular Expressions

    p5140-(?^...) construct signifies default modifiers
    p5140-/d, /l, /u, and /a modifiers
    p5140-Non-destructive substitution