Road Map

The current version is 1.1. It is considered an alpha-quality release.
The following items are on the roadmap, roughly sorted by priority:

go through each standard method and object and make sure the implementation actually works

optimize handling of javascript numbers and strings by using php types instead of js_val objects whenever appropriate

Once that's done, there's always more stuff on the wishlist:

make sure exceptions can't crash the php engine. that means stop using call_user_func*()

implement regular expressions. Not a big deal, except for the regexp literals.

add support for unicode strings. Not very hard either.

add support for unicode identifiers. A bit trickier as it requires the lexer to be unicode aware.

add optional support for eval() and Function(). not a big deal if the parser is reasonably speedy.

...