You should have a look at Squirrel (http://www.squirrel-lang.org/ http://www.squirrel-lang.org/) - it addresses most of the points above but is still very light

You should have a look at Squirrel (http://www.squirrel-lang.org/ http://www.squirrel-lang.org/) - it addresses most of the points above but is still very lightweight and easy to embed. The main disadvantage is that the documentation and community is not as well developed as Lua.