Collection of kludges for js

• autocasts.js - disable autocasts of obejcts to string/number in js
• missed_properties.js - throw error you try to get unexisting property from object. Helps w/ typos
• missed_vars.js - throw error if you forgot var
• real private via double prototype.safejs - real privates in js!
• types.js - add typing to fn's args and local vars, check arity of fn
• const.js - use const :)

all examples uses safejs subdialect of js