Language support for:

• A non-destructive s/// operator which returns the new string.
• subs/methods with proper parameter lists (the usual stuff: names, Perl types, default values, basic type annotations)
• Calling subs/methods with either positional or named arguments.
• Declared methods, like "sub" but with implicitly declared $self.
• Declared class methods, like "sub" but with implicitly declared $class.
• Autoboxing which treats e.g. hashes and hashrefs in a similar way. This may remove the need to fix the ugly dereferencing syntax mess.

Many of these things seem fairly compatible with Perl 5. Some may just need a bit more support in core perl to be solid and/or fast enough to be usable.

/J

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