JavaScript bloat

>"In 1998, a complex JavaScript application was a few dozen lines of code. By 2008, leading-edge Web applications like Hotmail, Gmail, and CNN.com included hundreds of thousands of lines of JavaScript," said the Microsoft JavaScript team members, Shanku Niyogi, Amanda Silver, John Montgomery, Luke Hoban, and Steve Lucco. "Today, there are Web applications with a million lines of JavaScript. These Web applications look more and more like the applications we run on our desktops."

http://news.cnet.com/8301-30685_3-57330431-264/microsoft-shoots-down-googles-dart-language/

If you really needs typed vars you can hack them in with typed arrays(use vars from 1 array elem only)
a=Uint32Array(1) //<-- this is a uint32 pointed value as array
a[0]=1
a[0]-=2
document.write(a[0])
result:
4294967295